{"subject":"chemistry","questions":[{"q":"Calculate the relative molecular mass of Al₂O₃. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["100","102","104","118"],"a":1,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of MgSO₄. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["122","118","120","136"],"a":2,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of NaCl. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["58.5","60.5","74.5","56.5"],"a":0,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of Fe₂O₃. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["176","160","162","158"],"a":1,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of NaOH. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["38","42","40","56"],"a":2,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of CaCO₃. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["100","116","98","102"],"a":0,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of HCl. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["36.5","34.5","52.5","38.5"],"a":0,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of CaO. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["56","58","72","54"],"a":0,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of H₂SO₄. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["114","98","100","96"],"a":1,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of KOH. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["56","58","72","54"],"a":0,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of C₂H₅OH. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["62","48","46","44"],"a":2,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of CH₄. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["14","32","18","16"],"a":3,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of CO₂. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["60","42","46","44"],"a":3,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of MgO. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["38","56","40","42"],"a":2,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of ZnO. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["79","83","81","97"],"a":2,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of H₂O. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["16","18","34","20"],"a":1,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of HNO₃. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["61","65","79","63"],"a":3,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of CuSO₄. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["162","158","176","160"],"a":3,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of NH₃. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["17","19","33","15"],"a":0,"t":"Mole Concept","d":"Easy"},{"q":"Calculate the relative molecular mass of Na₂CO₃. (H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Cu = 64, Zn = 65)","o":["106","122","108","104"],"a":0,"t":"Mole Concept","d":"Easy"},{"q":"How many moles are contained in 189 g of HNO₃? (Molar mass = 63 g/mol)","o":["4","2","3","6"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 504 g of CaO? (Molar mass = 56 g/mol)","o":["10","9","8","18"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 315 g of HNO₃? (Molar mass = 63 g/mol)","o":["6","4","5","10"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 63 g of HNO₃? (Molar mass = 63 g/mol)","o":["2","1/2","0.5","1"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 243 g of ZnO? (Molar mass = 81 g/mol)","o":["4","6","3","2"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 196 g of H₂SO₄? (Molar mass = 98 g/mol)","o":["1","4","2","3"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 320 g of CuSO₄? (Molar mass = 160 g/mol)","o":["2","3","1","4"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 448 g of CaO? (Molar mass = 56 g/mol)","o":["9","8","16","7"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 51 g of NH₃? (Molar mass = 17 g/mol)","o":["6","2","4","3"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 336 g of KOH? (Molar mass = 56 g/mol)","o":["12","5","7","6"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 16 g of CH₄? (Molar mass = 16 g/mol)","o":["0.5","1/2","2","1"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 264 g of CO₂? (Molar mass = 44 g/mol)","o":["7","6","12","5"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 742 g of Na₂CO₃? (Molar mass = 106 g/mol)","o":["6","8","14","7"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 396 g of CO₂? (Molar mass = 44 g/mol)","o":["18","10","9","8"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 504 g of KOH? (Molar mass = 56 g/mol)","o":["9","8","18","10"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 126 g of HNO₃? (Molar mass = 63 g/mol)","o":["3","4","2","1"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 162 g of H₂O? (Molar mass = 18 g/mol)","o":["10","18","9","8"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 882 g of H₂SO₄? (Molar mass = 98 g/mol)","o":["10","8","18","9"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 48 g of CH₄? (Molar mass = 16 g/mol)","o":["2","3","6","4"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 300 g of CaCO₃? (Molar mass = 100 g/mol)","o":["6","4","3","2"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 46 g of C₂H₅OH? (Molar mass = 46 g/mol)","o":["1/2","1","2","0.5"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 636 g of Na₂CO₃? (Molar mass = 106 g/mol)","o":["12","6","7","5"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 106 g of Na₂CO₃? (Molar mass = 106 g/mol)","o":["1","0.5","2","1/2"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 800 g of Fe₂O₃? (Molar mass = 160 g/mol)","o":["5","6","4","10"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 224 g of KOH? (Molar mass = 56 g/mol)","o":["8","4","3","5"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 136 g of NH₃? (Molar mass = 17 g/mol)","o":["8","16","7","9"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 180 g of H₂O? (Molar mass = 18 g/mol)","o":["11","10","9","20"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 224 g of CaO? (Molar mass = 56 g/mol)","o":["4","8","5","3"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 368 g of C₂H₅OH? (Molar mass = 46 g/mol)","o":["9","16","8","7"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 56 g of CaO? (Molar mass = 56 g/mol)","o":["2","1/2","1","0.5"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 378 g of HNO₃? (Molar mass = 63 g/mol)","o":["12","5","7","6"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 32 g of CH₄? (Molar mass = 16 g/mol)","o":["4","1","2","3"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 80 g of CH₄? (Molar mass = 16 g/mol)","o":["10","5","6","4"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 240 g of NaOH? (Molar mass = 40 g/mol)","o":["5","12","6","7"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 117 g of NaCl? (Molar mass = 58.5 g/mol)","o":["1","2","4","3"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 480 g of MgSO₄? (Molar mass = 120 g/mol)","o":["5","3","8","4"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 560 g of CaO? (Molar mass = 56 g/mol)","o":["9","10","11","20"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 112 g of CH₄? (Molar mass = 16 g/mol)","o":["6","8","14","7"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 88 g of CO₂? (Molar mass = 44 g/mol)","o":["1","4","2","3"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 408 g of Al₂O₃? (Molar mass = 102 g/mol)","o":["8","5","4","3"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 18 g of H₂O? (Molar mass = 18 g/mol)","o":["0.5","1/2","1","2"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 153 g of NH₃? (Molar mass = 17 g/mol)","o":["8","18","9","10"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 1120 g of Fe₂O₃? (Molar mass = 160 g/mol)","o":["8","14","6","7"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 392 g of CaO? (Molar mass = 56 g/mol)","o":["7","8","6","14"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 72 g of H₂O? (Molar mass = 18 g/mol)","o":["4","3","8","5"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 612 g of Al₂O₃? (Molar mass = 102 g/mol)","o":["6","12","7","5"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 1440 g of Fe₂O₃? (Molar mass = 160 g/mol)","o":["8","10","9","18"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 400 g of MgO? (Molar mass = 40 g/mol)","o":["11","9","20","10"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 360 g of MgO? (Molar mass = 40 g/mol)","o":["9","10","8","18"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 234 g of NaCl? (Molar mass = 58.5 g/mol)","o":["5","8","4","3"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 640 g of CuSO₄? (Molar mass = 160 g/mol)","o":["4","3","5","8"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 112 g of CaO? (Molar mass = 56 g/mol)","o":["2","3","1","4"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 480 g of Fe₂O₃? (Molar mass = 160 g/mol)","o":["6","3","4","2"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 168 g of CaO? (Molar mass = 56 g/mol)","o":["6","2","4","3"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 720 g of MgSO₄? (Molar mass = 120 g/mol)","o":["12","7","5","6"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 729 g of ZnO? (Molar mass = 81 g/mol)","o":["10","18","8","9"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 80 g of NaOH? (Molar mass = 40 g/mol)","o":["3","2","1","4"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 230 g of C₂H₅OH? (Molar mass = 46 g/mol)","o":["5","10","4","6"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 252 g of HNO₃? (Molar mass = 63 g/mol)","o":["5","4","8","3"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 132 g of CO₂? (Molar mass = 44 g/mol)","o":["2","3","4","6"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 200 g of CaCO₃? (Molar mass = 100 g/mol)","o":["1","4","2","3"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 44 g of CO₂? (Molar mass = 44 g/mol)","o":["1","0.5","1/2","2"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 600 g of CaCO₃? (Molar mass = 100 g/mol)","o":["12","7","6","5"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 34 g of NH₃? (Molar mass = 17 g/mol)","o":["3","1","2","4"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 168 g of KOH? (Molar mass = 56 g/mol)","o":["2","6","3","4"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 212 g of Na₂CO₃? (Molar mass = 106 g/mol)","o":["2","4","3","1"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 848 g of Na₂CO₃? (Molar mass = 106 g/mol)","o":["7","9","8","16"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 294 g of H₂SO₄? (Molar mass = 98 g/mol)","o":["4","6","3","2"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 146 g of HCl? (Molar mass = 36.5 g/mol)","o":["5","8","3","4"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 714 g of Al₂O₃? (Molar mass = 102 g/mol)","o":["14","7","6","8"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 392 g of H₂SO₄? (Molar mass = 98 g/mol)","o":["4","3","8","5"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 68 g of NH₃? (Molar mass = 17 g/mol)","o":["3","4","5","8"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 800 g of CaCO₃? (Molar mass = 100 g/mol)","o":["16","8","7","9"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 280 g of MgO? (Molar mass = 40 g/mol)","o":["6","8","14","7"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 54 g of H₂O? (Molar mass = 18 g/mol)","o":["2","3","6","4"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 280 g of CaO? (Molar mass = 56 g/mol)","o":["10","6","5","4"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 400 g of NaOH? (Molar mass = 40 g/mol)","o":["10","11","20","9"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 486 g of ZnO? (Molar mass = 81 g/mol)","o":["12","6","5","7"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 240 g of MgSO₄? (Molar mass = 120 g/mol)","o":["1","2","4","3"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 1200 g of MgSO₄? (Molar mass = 120 g/mol)","o":["11","10","20","9"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 414 g of C₂H₅OH? (Molar mass = 46 g/mol)","o":["8","18","10","9"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 119 g of NH₃? (Molar mass = 17 g/mol)","o":["14","8","6","7"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 120 g of MgSO₄? (Molar mass = 120 g/mol)","o":["0.5","1","2","1/2"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 365 g of HCl? (Molar mass = 36.5 g/mol)","o":["9","11","10","20"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 126 g of H₂O? (Molar mass = 18 g/mol)","o":["14","6","7","8"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 318 g of Na₂CO₃? (Molar mass = 106 g/mol)","o":["4","2","6","3"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 184 g of C₂H₅OH? (Molar mass = 46 g/mol)","o":["3","5","4","8"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 392 g of KOH? (Molar mass = 56 g/mol)","o":["7","14","8","6"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 120 g of NaOH? (Molar mass = 40 g/mol)","o":["6","3","2","4"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 480 g of CuSO₄? (Molar mass = 160 g/mol)","o":["3","6","2","4"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 960 g of CuSO₄? (Molar mass = 160 g/mol)","o":["12","7","5","6"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 800 g of CuSO₄? (Molar mass = 160 g/mol)","o":["4","6","5","10"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 144 g of CH₄? (Molar mass = 16 g/mol)","o":["9","18","10","8"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 56 g of KOH? (Molar mass = 56 g/mol)","o":["0.5","1","2","1/2"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 351 g of NaCl? (Molar mass = 58.5 g/mol)","o":["12","6","7","5"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 1060 g of Na₂CO₃? (Molar mass = 106 g/mol)","o":["20","11","9","10"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 440 g of CO₂? (Molar mass = 44 g/mol)","o":["10","11","20","9"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 648 g of ZnO? (Molar mass = 81 g/mol)","o":["7","8","16","9"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 220 g of CO₂? (Molar mass = 44 g/mol)","o":["10","4","5","6"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"How many moles are contained in 240 g of MgO? (Molar mass = 40 g/mol)","o":["7","6","5","12"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of HNO₃. (Molar mass = 63 g/mol)","o":["21 g","252 g","189 g","66 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of Al₂O₃. (Molar mass = 102 g/mol)","o":["29.1429 g","105.5 g","357 g","459 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of NaOH. (Molar mass = 40 g/mol)","o":["200 g","44 g","10 g","160 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of MgO. (Molar mass = 40 g/mol)","o":["60 g","40.5 g","80 g","20 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of H₂O. (Molar mass = 18 g/mol)","o":["36 g","18.5 g","9 g","27 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of CH₄. (Molar mass = 16 g/mol)","o":["40 g","17.5 g","10.6667 g","24 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of Fe₂O₃. (Molar mass = 160 g/mol)","o":["162 g","80 g","320 g","480 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of HNO₃. (Molar mass = 63 g/mol)","o":["220.5 g","283.5 g","66.5 g","18 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of HCl. (Molar mass = 36.5 g/mol)","o":["38.5 g","18.25 g","73 g","109.5 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of H₂O. (Molar mass = 18 g/mol)","o":["27 g","19.5 g","45 g","12 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of HNO₃. (Molar mass = 63 g/mol)","o":["42 g","64.5 g","94.5 g","157.5 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of KOH. (Molar mass = 56 g/mol)","o":["60 g","280 g","14 g","224 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of CH₄. (Molar mass = 16 g/mol)","o":["16.5 g","8 g","32 g","24 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of HNO₃. (Molar mass = 63 g/mol)","o":["157.5 g","65.5 g","220.5 g","25.2 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of CaO. (Molar mass = 56 g/mol)","o":["112 g","84 g","56.5 g","28 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of H₂SO₄. (Molar mass = 98 g/mol)","o":["392 g","32.6667 g","101 g","294 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of Al₂O₃. (Molar mass = 102 g/mol)","o":["34 g","408 g","105 g","306 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of CO₂. (Molar mass = 44 g/mol)","o":["12.5714 g","198 g","154 g","47.5 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of CaO. (Molar mass = 56 g/mol)","o":["60 g","280 g","224 g","14 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of CaCO₃. (Molar mass = 100 g/mol)","o":["104 g","25 g","400 g","500 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of ZnO. (Molar mass = 81 g/mol)","o":["84.5 g","283.5 g","364.5 g","23.1429 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of NaCl. (Molar mass = 58.5 g/mol)","o":["87.75 g","59 g","117 g","29.25 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of ZnO. (Molar mass = 81 g/mol)","o":["54 g","121.5 g","202.5 g","82.5 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of HNO₃. (Molar mass = 63 g/mol)","o":["65 g","31.5 g","189 g","126 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of CaCO₃. (Molar mass = 100 g/mol)","o":["400 g","33.3333 g","300 g","103 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of Fe₂O₃. (Molar mass = 160 g/mol)","o":["720 g","45.7143 g","163.5 g","560 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of Fe₂O₃. (Molar mass = 160 g/mol)","o":["106.667 g","240 g","400 g","161.5 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of ZnO. (Molar mass = 81 g/mol)","o":["324 g","85 g","20.25 g","405 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of Al₂O₃. (Molar mass = 102 g/mol)","o":["106 g","408 g","25.5 g","510 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of Na₂CO₃. (Molar mass = 106 g/mol)","o":["477 g","371 g","109.5 g","30.2857 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of NaCl. (Molar mass = 58.5 g/mol)","o":["292.5 g","234 g","14.625 g","62.5 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of KOH. (Molar mass = 56 g/mol)","o":["140 g","57.5 g","84 g","37.3333 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of CaCO₃. (Molar mass = 100 g/mol)","o":["350 g","103.5 g","28.5714 g","450 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of C₂H₅OH. (Molar mass = 46 g/mol)","o":["92 g","23 g","138 g","48 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of CuSO₄. (Molar mass = 160 g/mol)","o":["800 g","640 g","40 g","164 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of Fe₂O₃. (Molar mass = 160 g/mol)","o":["162.5 g","400 g","64 g","560 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of MgSO₄. (Molar mass = 120 g/mol)","o":["240 g","360 g","122 g","60 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of CO₂. (Molar mass = 44 g/mol)","o":["88 g","46 g","132 g","22 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of H₂SO₄. (Molar mass = 98 g/mol)","o":["49 g","100 g","294 g","196 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of KOH. (Molar mass = 56 g/mol)","o":["28 g","56.5 g","84 g","112 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of KOH. (Molar mass = 56 g/mol)","o":["252 g","16 g","59.5 g","196 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of Na₂CO₃. (Molar mass = 106 g/mol)","o":["26.5 g","424 g","530 g","110 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of CH₄. (Molar mass = 16 g/mol)","o":["48 g","32 g","8 g","18 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of MgSO₄. (Molar mass = 120 g/mol)","o":["121.5 g","300 g","180 g","80 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of Na₂CO₃. (Molar mass = 106 g/mol)","o":["212 g","53 g","159 g","106.5 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of NaCl. (Molar mass = 58.5 g/mol)","o":["175.5 g","61.5 g","19.5 g","234 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of H₂O. (Molar mass = 18 g/mol)","o":["5.14286 g","63 g","81 g","21.5 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of NaOH. (Molar mass = 40 g/mol)","o":["20 g","80 g","42 g","120 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of HCl. (Molar mass = 36.5 g/mol)","o":["164.25 g","127.75 g","40 g","10.4286 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of NaCl. (Molar mass = 58.5 g/mol)","o":["146.25 g","23.4 g","61 g","204.75 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of KOH. (Molar mass = 56 g/mol)","o":["59 g","168 g","18.6667 g","224 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of MgO. (Molar mass = 40 g/mol)","o":["26.6667 g","100 g","60 g","41.5 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of CaCO₃. (Molar mass = 100 g/mol)","o":["40 g","102.5 g","250 g","350 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of H₂SO₄. (Molar mass = 98 g/mol)","o":["343 g","39.2 g","245 g","100.5 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of NaOH. (Molar mass = 40 g/mol)","o":["80 g","40.5 g","20 g","60 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of CaCO₃. (Molar mass = 100 g/mol)","o":["200 g","300 g","102 g","50 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of C₂H₅OH. (Molar mass = 46 g/mol)","o":["49 g","184 g","15.3333 g","138 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of NH₃. (Molar mass = 17 g/mol)","o":["20.5 g","4.85714 g","76.5 g","59.5 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of CuSO₄. (Molar mass = 160 g/mol)","o":["163.5 g","560 g","45.7143 g","720 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of CaO. (Molar mass = 56 g/mol)","o":["252 g","59.5 g","16 g","196 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of H₂O. (Molar mass = 18 g/mol)","o":["54 g","72 g","21 g","6 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of CH₄. (Molar mass = 16 g/mol)","o":["19 g","64 g","5.33333 g","48 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of Al₂O₃. (Molar mass = 102 g/mol)","o":["357 g","104.5 g","40.8 g","255 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of Fe₂O₃. (Molar mass = 160 g/mol)","o":["800 g","640 g","164 g","40 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of C₂H₅OH. (Molar mass = 46 g/mol)","o":["23 g","69 g","46.5 g","92 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of ZnO. (Molar mass = 81 g/mol)","o":["243 g","84 g","324 g","27 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of CaO. (Molar mass = 56 g/mol)","o":["168 g","28 g","58 g","112 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of H₂SO₄. (Molar mass = 98 g/mol)","o":["490 g","24.5 g","102 g","392 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of H₂O. (Molar mass = 18 g/mol)","o":["90 g","4.5 g","22 g","72 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of MgSO₄. (Molar mass = 120 g/mol)","o":["34.2857 g","540 g","420 g","123.5 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of Na₂CO₃. (Molar mass = 106 g/mol)","o":["107.5 g","159 g","265 g","70.6667 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of HNO₃. (Molar mass = 63 g/mol)","o":["31.5 g","126 g","94.5 g","63.5 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of CaO. (Molar mass = 56 g/mol)","o":["84 g","57.5 g","37.3333 g","140 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of Na₂CO₃. (Molar mass = 106 g/mol)","o":["35.3333 g","318 g","424 g","109 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of ZnO. (Molar mass = 81 g/mol)","o":["32.4 g","202.5 g","83.5 g","283.5 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of HNO₃. (Molar mass = 63 g/mol)","o":["67 g","15.75 g","315 g","252 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of CaCO₃. (Molar mass = 100 g/mol)","o":["101.5 g","150 g","66.6667 g","250 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of H₂O. (Molar mass = 18 g/mol)","o":["20 g","36 g","9 g","54 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of HCl. (Molar mass = 36.5 g/mol)","o":["39.5 g","146 g","12.1667 g","109.5 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 4 mole(s) of NH₃. (Molar mass = 17 g/mol)","o":["4.25 g","85 g","21 g","68 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of Na₂CO₃. (Molar mass = 106 g/mol)","o":["53 g","212 g","318 g","108 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of MgO. (Molar mass = 40 g/mol)","o":["140 g","42.5 g","16 g","100 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of KOH. (Molar mass = 56 g/mol)","o":["28 g","58 g","112 g","168 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of Al₂O₃. (Molar mass = 102 g/mol)","o":["103.5 g","255 g","153 g","68 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of NaOH. (Molar mass = 40 g/mol)","o":["43.5 g","11.4286 g","140 g","180 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2 mole(s) of ZnO. (Molar mass = 81 g/mol)","o":["243 g","40.5 g","83 g","162 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of HCl. (Molar mass = 36.5 g/mol)","o":["24.3333 g","38 g","54.75 g","91.25 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of NH₃. (Molar mass = 17 g/mol)","o":["34 g","25.5 g","8.5 g","17.5 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of CO₂. (Molar mass = 44 g/mol)","o":["154 g","46.5 g","110 g","17.6 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of Na₂CO₃. (Molar mass = 106 g/mol)","o":["265 g","42.4 g","371 g","108.5 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of H₂O. (Molar mass = 18 g/mol)","o":["20.5 g","63 g","45 g","7.2 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of NaOH. (Molar mass = 40 g/mol)","o":["160 g","43 g","120 g","13.3333 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of KOH. (Molar mass = 56 g/mol)","o":["196 g","22.4 g","58.5 g","140 g"],"a":3,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 1.5 mole(s) of CuSO₄. (Molar mass = 160 g/mol)","o":["400 g","240 g","106.667 g","161.5 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3 mole(s) of NH₃. (Molar mass = 17 g/mol)","o":["68 g","5.66667 g","51 g","20 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 2.5 mole(s) of CuSO₄. (Molar mass = 160 g/mol)","o":["64 g","400 g","560 g","162.5 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of CH₄. (Molar mass = 16 g/mol)","o":["72 g","19.5 g","56 g","4.57143 g"],"a":2,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 3.5 mole(s) of C₂H₅OH. (Molar mass = 46 g/mol)","o":["13.1429 g","161 g","49.5 g","207 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of H₂SO₄. (Molar mass = 98 g/mol)","o":["49 g","196 g","98.5 g","147 g"],"a":0,"t":"Mole Concept","d":"Medium"},{"q":"Calculate the mass of 0.5 mole(s) of Fe₂O₃. (Molar mass = 160 g/mol)","o":["160.5 g","80 g","240 g","320 g"],"a":1,"t":"Mole Concept","d":"Medium"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 1 dm³ of a 1.5 mol/dm³ solution?","o":["84 g","56 g","168 g","140 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 2 dm³ of a 1 mol/dm³ solution?","o":["294 g","98 g","196 g","392 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 0.5 dm³ of a 1.5 mol/dm³ solution?","o":["90 g","60 g","180 g","210 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of Na₂CO₃ (molar mass 106 g/mol) is needed to prepare 2 dm³ of a 1 mol/dm³ solution?","o":["106 g","212 g","424 g","318 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 2.5 dm³ of a 1.5 mol/dm³ solution?","o":["472.5 g","94.5 g","157.5 g","236.25 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 2 dm³ of a 2 mol/dm³ solution?","o":["800 g","640 g","320 g","1280 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 2.5 dm³ of a 1.5 mol/dm³ solution?","o":["900 g","180 g","300 g","450 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 2.5 dm³ of a 2 mol/dm³ solution?","o":["126 g","157.5 g","315 g","630 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 1 dm³ of a 1.5 mol/dm³ solution?","o":["120 g","40 g","100 g","60 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 1.5 dm³ of a 2 mol/dm³ solution?","o":["360 g","180 g","720 g","240 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 1 dm³ of a 2 mol/dm³ solution?","o":["63 g","252 g","189 g","126 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 2.5 dm³ of a 0.5 mol/dm³ solution?","o":["146.25 g","29.25 g","131.625 g","73.125 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 2.5 dm³ of a 0.5 mol/dm³ solution?","o":["141.75 g","31.5 g","78.75 g","157.5 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 2.5 dm³ of a 2 mol/dm³ solution?","o":["245 g","196 g","980 g","490 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 1.5 dm³ of a 1.5 mol/dm³ solution?","o":["204.75 g","283.5 g","141.75 g","94.5 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 1.5 dm³ of a 1.5 mol/dm³ solution?","o":["720 g","240 g","520 g","360 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 1 dm³ of a 2 mol/dm³ solution?","o":["98 g","392 g","294 g","196 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of Na₂CO₃ (molar mass 106 g/mol) is needed to prepare 1.5 dm³ of a 0.5 mol/dm³ solution?","o":["79.5 g","159 g","53 g","185.5 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 2 dm³ of a 1.5 mol/dm³ solution?","o":["189 g","126 g","378 g","94.5 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 2 dm³ of a 2 mol/dm³ solution?","o":["234 g","292.5 g","468 g","117 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 2 dm³ of a 1.5 mol/dm³ solution?","o":["294 g","588 g","196 g","147 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 1.5 dm³ of a 2 mol/dm³ solution?","o":["73 g","54.75 g","109.5 g","219 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 2.5 dm³ of a 1.5 mol/dm³ solution?","o":["600 g","400 g","1200 g","240 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 1.5 dm³ of a 0.5 mol/dm³ solution?","o":["210 g","60 g","180 g","90 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 2 dm³ of a 1.5 mol/dm³ solution?","o":["480 g","960 g","320 g","240 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 2 dm³ of a 1 mol/dm³ solution?","o":["175.5 g","58.5 g","117 g","234 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 1.5 dm³ of a 1.5 mol/dm³ solution?","o":["252 g","182 g","84 g","126 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 1.5 dm³ of a 2 mol/dm³ solution?","o":["120 g","240 g","80 g","60 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 2 dm³ of a 1 mol/dm³ solution?","o":["189 g","63 g","126 g","252 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 0.5 dm³ of a 1.5 mol/dm³ solution?","o":["28 g","98 g","42 g","84 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 2.5 dm³ of a 1.5 mol/dm³ solution?","o":["84 g","420 g","210 g","140 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of Na₂CO₃ (molar mass 106 g/mol) is needed to prepare 1.5 dm³ of a 1.5 mol/dm³ solution?","o":["344.5 g","238.5 g","477 g","159 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 1 dm³ of a 2 mol/dm³ solution?","o":["160 g","480 g","640 g","320 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 1.5 dm³ of a 1 mol/dm³ solution?","o":["109.5 g","36.5 g","54.75 g","91.25 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 2.5 dm³ of a 0.5 mol/dm³ solution?","o":["28 g","140 g","126 g","70 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 2 dm³ of a 1 mol/dm³ solution?","o":["168 g","112 g","56 g","224 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of Na₂CO₃ (molar mass 106 g/mol) is needed to prepare 2.5 dm³ of a 0.5 mol/dm³ solution?","o":["53 g","132.5 g","238.5 g","265 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 2.5 dm³ of a 1 mol/dm³ solution?","o":["140 g","200 g","40 g","100 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 1 dm³ of a 1.5 mol/dm³ solution?","o":["36.5 g","91.25 g","109.5 g","54.75 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 0.5 dm³ of a 1.5 mol/dm³ solution?","o":["70 g","30 g","60 g","20 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 1.5 dm³ of a 1 mol/dm³ solution?","o":["168 g","140 g","84 g","56 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 2 dm³ of a 2 mol/dm³ solution?","o":["224 g","112 g","280 g","448 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 1.5 dm³ of a 2 mol/dm³ solution?","o":["126 g","189 g","94.5 g","378 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 2.5 dm³ of a 1 mol/dm³ solution?","o":["600 g","300 g","120 g","420 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 2.5 dm³ of a 0.5 mol/dm³ solution?","o":["18.25 g","45.625 g","82.125 g","91.25 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 2 dm³ of a 1 mol/dm³ solution?","o":["160 g","320 g","640 g","480 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 1 dm³ of a 1.5 mol/dm³ solution?","o":["157.5 g","189 g","63 g","94.5 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 1 dm³ of a 1.5 mol/dm³ solution?","o":["120 g","360 g","180 g","300 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 2.5 dm³ of a 1 mol/dm³ solution?","o":["343 g","98 g","245 g","490 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 2 dm³ of a 1.5 mol/dm³ solution?","o":["117 g","351 g","175.5 g","87.75 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 1.5 dm³ of a 1.5 mol/dm³ solution?","o":["190.125 g","263.25 g","87.75 g","131.625 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 1.5 dm³ of a 1.5 mol/dm³ solution?","o":["130 g","60 g","90 g","180 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 2.5 dm³ of a 2 mol/dm³ solution?","o":["400 g","80 g","100 g","200 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 1.5 dm³ of a 0.5 mol/dm³ solution?","o":["147 g","171.5 g","49 g","73.5 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 2 dm³ of a 2 mol/dm³ solution?","o":["480 g","240 g","600 g","960 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 2.5 dm³ of a 2 mol/dm³ solution?","o":["1600 g","320 g","800 g","400 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 2.5 dm³ of a 0.5 mol/dm³ solution?","o":["150 g","60 g","270 g","300 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 0.5 dm³ of a 1.5 mol/dm³ solution?","o":["102.375 g","87.75 g","43.875 g","29.25 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 1.5 dm³ of a 0.5 mol/dm³ solution?","o":["27.375 g","63.875 g","18.25 g","54.75 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 2.5 dm³ of a 1 mol/dm³ solution?","o":["140 g","280 g","196 g","56 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of Na₂CO₃ (molar mass 106 g/mol) is needed to prepare 2 dm³ of a 1.5 mol/dm³ solution?","o":["212 g","318 g","636 g","159 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 1 dm³ of a 2 mol/dm³ solution?","o":["40 g","160 g","120 g","80 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 0.5 dm³ of a 1.5 mol/dm³ solution?","o":["63.875 g","54.75 g","18.25 g","27.375 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 0.5 dm³ of a 1.5 mol/dm³ solution?","o":["94.5 g","110.25 g","31.5 g","47.25 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 1.5 dm³ of a 0.5 mol/dm³ solution?","o":["30 g","20 g","70 g","60 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 2.5 dm³ of a 2 mol/dm³ solution?","o":["91.25 g","365 g","182.5 g","73 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 1 dm³ of a 2 mol/dm³ solution?","o":["73 g","109.5 g","146 g","36.5 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 2 dm³ of a 1.5 mol/dm³ solution?","o":["360 g","720 g","240 g","180 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 2 dm³ of a 1.5 mol/dm³ solution?","o":["60 g","80 g","120 g","240 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 1.5 dm³ of a 2 mol/dm³ solution?","o":["320 g","240 g","480 g","960 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 2.5 dm³ of a 1 mol/dm³ solution?","o":["220.5 g","315 g","157.5 g","63 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 0.5 dm³ of a 1.5 mol/dm³ solution?","o":["280 g","240 g","120 g","80 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of Na₂CO₃ (molar mass 106 g/mol) is needed to prepare 2.5 dm³ of a 1.5 mol/dm³ solution?","o":["397.5 g","159 g","265 g","795 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 2 dm³ of a 1.5 mol/dm³ solution?","o":["112 g","84 g","336 g","168 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 1.5 dm³ of a 0.5 mol/dm³ solution?","o":["102.375 g","87.75 g","29.25 g","43.875 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of HNO₃ (molar mass 63 g/mol) is needed to prepare 1.5 dm³ of a 0.5 mol/dm³ solution?","o":["47.25 g","94.5 g","31.5 g","110.25 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of Na₂CO₃ (molar mass 106 g/mol) is needed to prepare 2 dm³ of a 2 mol/dm³ solution?","o":["212 g","424 g","848 g","530 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 1.5 dm³ of a 1.5 mol/dm³ solution?","o":["220.5 g","147 g","318.5 g","441 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 2 dm³ of a 1 mol/dm³ solution?","o":["160 g","40 g","120 g","80 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 2.5 dm³ of a 2 mol/dm³ solution?","o":["600 g","300 g","240 g","1200 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 2.5 dm³ of a 1 mol/dm³ solution?","o":["182.5 g","36.5 g","127.75 g","91.25 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 1.5 dm³ of a 1 mol/dm³ solution?","o":["60 g","100 g","40 g","120 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 1 dm³ of a 1.5 mol/dm³ solution?","o":["294 g","245 g","147 g","98 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 1.5 dm³ of a 0.5 mol/dm³ solution?","o":["80 g","120 g","280 g","240 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of CuSO₄ (molar mass 160 g/mol) is needed to prepare 1 dm³ of a 1.5 mol/dm³ solution?","o":["240 g","480 g","160 g","400 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 2.5 dm³ of a 1 mol/dm³ solution?","o":["292.5 g","146.25 g","204.75 g","58.5 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 2.5 dm³ of a 1.5 mol/dm³ solution?","o":["60 g","300 g","100 g","150 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of NaOH (molar mass 40 g/mol) is needed to prepare 2.5 dm³ of a 0.5 mol/dm³ solution?","o":["100 g","50 g","20 g","90 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 1.5 dm³ of a 2 mol/dm³ solution?","o":["84 g","112 g","168 g","336 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of KOH (molar mass 56 g/mol) is needed to prepare 1 dm³ of a 2 mol/dm³ solution?","o":["112 g","56 g","224 g","168 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 1.5 dm³ of a 1 mol/dm³ solution?","o":["146.25 g","58.5 g","175.5 g","87.75 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 0.5 dm³ of a 1.5 mol/dm³ solution?","o":["73.5 g","147 g","49 g","171.5 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of Na₂CO₃ (molar mass 106 g/mol) is needed to prepare 2.5 dm³ of a 2 mol/dm³ solution?","o":["212 g","265 g","530 g","1060 g"],"a":2,"t":"Solutions","d":"Hard"},{"q":"What mass of MgSO₄ (molar mass 120 g/mol) is needed to prepare 1.5 dm³ of a 1 mol/dm³ solution?","o":["180 g","300 g","120 g","360 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 2 dm³ of a 2 mol/dm³ solution?","o":["392 g","784 g","196 g","490 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 1.5 dm³ of a 2 mol/dm³ solution?","o":["87.75 g","175.5 g","351 g","117 g"],"a":1,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 2 dm³ of a 1 mol/dm³ solution?","o":["146 g","36.5 g","109.5 g","73 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of H₂SO₄ (molar mass 98 g/mol) is needed to prepare 1.5 dm³ of a 1 mol/dm³ solution?","o":["147 g","245 g","294 g","98 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"What mass of HCl (molar mass 36.5 g/mol) is needed to prepare 2.5 dm³ of a 1.5 mol/dm³ solution?","o":["54.75 g","91.25 g","273.75 g","136.875 g"],"a":3,"t":"Solutions","d":"Hard"},{"q":"What mass of NaCl (molar mass 58.5 g/mol) is needed to prepare 2.5 dm³ of a 2 mol/dm³ solution?","o":["292.5 g","117 g","146.25 g","585 g"],"a":0,"t":"Solutions","d":"Hard"},{"q":"5 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["15","0.6","1.667","2.167"],"a":2,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 0.5 dm³ of solution. Find the concentration in mol/dm³.","o":["6","0.167","6.5","1.5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["2.25","1.5","3","1"],"a":3,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.8","1.056","11.25","0.556"],"a":3,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.833","7.5","1.7","1.2"],"a":3,"t":"Solutions","d":"Medium"},{"q":"5 mole of a solute is dissolved in 1 dm³ of solution. Find the concentration in mol/dm³.","o":["5","0.2","5.5","6"],"a":0,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.8","7.5","0.3","3.333"],"a":2,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.1","3.75","0.6","1.667"],"a":2,"t":"Solutions","d":"Medium"},{"q":"2 mole of a solute is dissolved in 1 dm³ of solution. Find the concentration in mol/dm³.","o":["2.5","2","0.5","3"],"a":1,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["6.25","1","1.5","5"],"a":1,"t":"Solutions","d":"Medium"},{"q":"2 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["2.5","0.9","10","0.4"],"a":3,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 0.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.75","7.5","7","0.143"],"a":2,"t":"Solutions","d":"Medium"},{"q":"0.5 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.2","0.7","5","1.25"],"a":0,"t":"Solutions","d":"Medium"},{"q":"5 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["1","1.5","10","25"],"a":0,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["1.625","1.125","0.889","18"],"a":1,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["1.333","0.75","1.25","12"],"a":1,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 1 dm³ of solution. Find the concentration in mol/dm³.","o":["4","4.5","0.286","3.5"],"a":3,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 1 dm³ of solution. Find the concentration in mol/dm³.","o":["0.333","4","3","3.5"],"a":2,"t":"Solutions","d":"Medium"},{"q":"0.5 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["8","0.125","0.625","2"],"a":1,"t":"Solutions","d":"Medium"},{"q":"1 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["0.25","4","0.75","5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 1 dm³ of solution. Find the concentration in mol/dm³.","o":["4","5","0.25","4.5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.714","1.9","1.4","8.75"],"a":2,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.357","10.5","0.857","1.167"],"a":2,"t":"Solutions","d":"Medium"},{"q":"0.5 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.75","3","0.833","0.333"],"a":3,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["1.125","1.6","0.625","10"],"a":2,"t":"Solutions","d":"Medium"},{"q":"5 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.3","3.333","7.5","3.833"],"a":1,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 2 dm³ of solution. Find the concentration in mol/dm³.","o":["0.571","2.25","7","1.75"],"a":3,"t":"Solutions","d":"Medium"},{"q":"1 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["2.5","0.9","3.5","0.4"],"a":3,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 2 dm³ of solution. Find the concentration in mol/dm³.","o":["2","0.5","2.5","8"],"a":0,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["9","1.5","1","6"],"a":2,"t":"Solutions","d":"Medium"},{"q":"2 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["9","2.25","0.444","0.944"],"a":2,"t":"Solutions","d":"Medium"},{"q":"2 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["5","0.8","1.25","1.3"],"a":1,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["22.5","1.111","0.9","1.4"],"a":2,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["18","1.389","0.889","1.125"],"a":2,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.5","12.25","7","1"],"a":3,"t":"Solutions","d":"Medium"},{"q":"5 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["2.5","0.5","12.5","2"],"a":3,"t":"Solutions","d":"Medium"},{"q":"1 mole of a solute is dissolved in 0.5 dm³ of solution. Find the concentration in mol/dm³.","o":["2","0.5","1.5","2.5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["2.3","0.556","1.8","11.25"],"a":2,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["1.833","0.75","1.333","12"],"a":2,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.333","0.833","6.75","3"],"a":0,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["3.5","3","0.333","6.75"],"a":1,"t":"Solutions","d":"Medium"},{"q":"5 mole of a solute is dissolved in 0.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.1","2.5","10.5","10"],"a":3,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["0.833","1.2","7.5","1.333"],"a":0,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.667","3.75","0.6","2.167"],"a":0,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.786","0.778","15.75","1.286"],"a":3,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["8.75","1.4","1.214","0.714"],"a":3,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["12.5","2","0.5","1"],"a":2,"t":"Solutions","d":"Medium"},{"q":"5 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["0.8","1.75","1.25","20"],"a":2,"t":"Solutions","d":"Medium"},{"q":"2 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.571","1.071","7","1.75"],"a":0,"t":"Solutions","d":"Medium"},{"q":"0.5 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["0.667","0.167","6","1.5"],"a":1,"t":"Solutions","d":"Medium"},{"q":"5 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["22.5","1.611","0.9","1.111"],"a":3,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 2 dm³ of solution. Find the concentration in mol/dm³.","o":["0.8","1.75","5","1.25"],"a":3,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["5.25","2.833","0.429","2.333"],"a":3,"t":"Solutions","d":"Medium"},{"q":"0.5 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.75","0.143","0.643","7"],"a":1,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 0.5 dm³ of solution. Find the concentration in mol/dm³.","o":["3.5","3","0.333","0.75"],"a":1,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 2 dm³ of solution. Find the concentration in mol/dm³.","o":["0.75","1.333","3","1.25"],"a":0,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 0.5 dm³ of solution. Find the concentration in mol/dm³.","o":["9","0.111","2.25","9.5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["13.5","1.5","1.167","0.667"],"a":3,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 0.5 dm³ of solution. Find the concentration in mol/dm³.","o":["2","0.125","8","8.5"],"a":2,"t":"Solutions","d":"Medium"},{"q":"1 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["4.5","3.5","0.786","0.286"],"a":3,"t":"Solutions","d":"Medium"},{"q":"1 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["2.5","0.667","1.5","1.167"],"a":1,"t":"Solutions","d":"Medium"},{"q":"2 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.333","1.833","0.75","3"],"a":0,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 2 dm³ of solution. Find the concentration in mol/dm³.","o":["2","6","0.667","1.5"],"a":3,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.143","0.875","14","1.643"],"a":0,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 2 dm³ of solution. Find the concentration in mol/dm³.","o":["0.444","2.25","2.75","9"],"a":1,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 1 dm³ of solution. Find the concentration in mol/dm³.","o":["3","0.4","3.5","2.5"],"a":3,"t":"Solutions","d":"Medium"},{"q":"2 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["1.5","6","0.667","1.167"],"a":2,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["6","2.667","0.875","0.375"],"a":3,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 1 dm³ of solution. Find the concentration in mol/dm³.","o":["1.5","2","0.667","2.5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.5","2","2.5","4.5"],"a":1,"t":"Solutions","d":"Medium"},{"q":"2.5 mole of a solute is dissolved in 0.5 dm³ of solution. Find the concentration in mol/dm³.","o":["5.5","5","1.25","0.2"],"a":1,"t":"Solutions","d":"Medium"},{"q":"0.5 mole of a solute is dissolved in 2 dm³ of solution. Find the concentration in mol/dm³.","o":["1","0.25","0.75","4"],"a":1,"t":"Solutions","d":"Medium"},{"q":"0.5 mole of a solute is dissolved in 1 dm³ of solution. Find the concentration in mol/dm³.","o":["2","1","0.5","1.5"],"a":2,"t":"Solutions","d":"Medium"},{"q":"5 mole of a solute is dissolved in 2 dm³ of solution. Find the concentration in mol/dm³.","o":["10","3","0.4","2.5"],"a":3,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 1 dm³ of solution. Find the concentration in mol/dm³.","o":["4.5","5.5","0.222","5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["1.5","2","0.667","13.5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"0.5 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["2.5","0.1","0.6","10"],"a":1,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["5.25","0.429","2.333","0.929"],"a":1,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 2.5 dm³ of solution. Find the concentration in mol/dm³.","o":["2.1","10","1.6","0.625"],"a":2,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["1.667","0.857","10.5","1.167"],"a":3,"t":"Solutions","d":"Medium"},{"q":"2 mole of a solute is dissolved in 0.5 dm³ of solution. Find the concentration in mol/dm³.","o":["4.5","1","4","0.25"],"a":2,"t":"Solutions","d":"Medium"},{"q":"5 mole of a solute is dissolved in 3.5 dm³ of solution. Find the concentration in mol/dm³.","o":["17.5","1.929","0.7","1.429"],"a":3,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["17.5","0.7","1.429","1.2"],"a":1,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.778","1.286","15.75","1.278"],"a":0,"t":"Solutions","d":"Medium"},{"q":"1.5 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["1","0.5","2","4.5"],"a":1,"t":"Solutions","d":"Medium"},{"q":"0.5 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.611","2.25","0.111","9"],"a":2,"t":"Solutions","d":"Medium"},{"q":"1 mole of a solute is dissolved in 2 dm³ of solution. Find the concentration in mol/dm³.","o":["1","3","0.5","2"],"a":2,"t":"Solutions","d":"Medium"},{"q":"2 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["8","1","0.5","2"],"a":2,"t":"Solutions","d":"Medium"},{"q":"4.5 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["1","1.5","20.25","9"],"a":0,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["8","1","1.5","16"],"a":1,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 1.5 dm³ of solution. Find the concentration in mol/dm³.","o":["2.667","3.167","6","0.375"],"a":0,"t":"Solutions","d":"Medium"},{"q":"3.5 mole of a solute is dissolved in 4 dm³ of solution. Find the concentration in mol/dm³.","o":["1.375","14","0.875","1.143"],"a":2,"t":"Solutions","d":"Medium"},{"q":"1 mole of a solute is dissolved in 4.5 dm³ of solution. Find the concentration in mol/dm³.","o":["0.222","0.722","5.5","4.5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"1 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["5","0.2","6","0.7"],"a":1,"t":"Solutions","d":"Medium"},{"q":"3 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.667","1.1","0.6","15"],"a":2,"t":"Solutions","d":"Medium"},{"q":"4 mole of a solute is dissolved in 5 dm³ of solution. Find the concentration in mol/dm³.","o":["1.3","1.25","20","0.8"],"a":3,"t":"Solutions","d":"Medium"},{"q":"1 mole of a solute is dissolved in 3 dm³ of solution. Find the concentration in mol/dm³.","o":["3","0.333","4","0.833"],"a":1,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 9 mol/dm³ acid is diluted to 30 cm³. Find the new concentration (mol/dm³).","o":["10","12","6","7"],"a":2,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 6 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["3","2","18","7"],"a":1,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 8 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["64","1","2","9"],"a":1,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 10 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["20","5","11","6"],"a":1,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 2 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["1","4","2","3"],"a":0,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 8 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["4","5","16","9"],"a":0,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 6 mol/dm³ acid is diluted to 20 cm³. Find the new concentration (mol/dm³).","o":["4","12","7","3"],"a":3,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 9 mol/dm³ acid is diluted to 30 cm³. Find the new concentration (mol/dm³).","o":["27","10","4","3"],"a":3,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 4 mol/dm³ acid is diluted to 40 cm³. Find the new concentration (mol/dm³).","o":["5","3","2","8"],"a":2,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 5 mol/dm³ acid is diluted to 50 cm³. Find the new concentration (mol/dm³).","o":["6","8","3","4"],"a":2,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 4 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["2","8","3","5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 7 mol/dm³ acid is diluted to 70 cm³. Find the new concentration (mol/dm³).","o":["10","8","3","2"],"a":3,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 7 mol/dm³ acid is diluted to 70 cm³. Find the new concentration (mol/dm³).","o":["8","1","2","49"],"a":1,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 2 mol/dm³ acid is diluted to 20 cm³. Find the new concentration (mol/dm³).","o":["2","3","1","4"],"a":2,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 2 mol/dm³ acid is diluted to 40 cm³. Find the new concentration (mol/dm³).","o":["4","1","2","3"],"a":1,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 4 mol/dm³ acid is diluted to 40 cm³. Find the new concentration (mol/dm³).","o":["3","5","4","7"],"a":0,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 10 mol/dm³ acid is diluted to 50 cm³. Find the new concentration (mol/dm³).","o":["7","13","6","11"],"a":2,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 8 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["4","9","5","16"],"a":0,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 8 mol/dm³ acid is diluted to 40 cm³. Find the new concentration (mol/dm³).","o":["32","3","2","9"],"a":2,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 6 mol/dm³ acid is diluted to 30 cm³. Find the new concentration (mol/dm³).","o":["3","18","2","7"],"a":2,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 4 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["16","2","1","5"],"a":2,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 8 mol/dm³ acid is diluted to 40 cm³. Find the new concentration (mol/dm³).","o":["9","5","16","4"],"a":3,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 4 mol/dm³ acid is diluted to 20 cm³. Find the new concentration (mol/dm³).","o":["2","8","3","5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 5 mol/dm³ acid is diluted to 50 cm³. Find the new concentration (mol/dm³).","o":["25","6","1","2"],"a":2,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 6 mol/dm³ acid is diluted to 40 cm³. Find the new concentration (mol/dm³).","o":["7","3","4","12"],"a":1,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 7 mol/dm³ acid is diluted to 70 cm³. Find the new concentration (mol/dm³).","o":["8","4","10","5"],"a":1,"t":"Solutions","d":"Medium"},{"q":"50 cm³ of 6 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["9","7","5","6"],"a":2,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 6 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["36","1","7","2"],"a":1,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 8 mol/dm³ acid is diluted to 20 cm³. Find the new concentration (mol/dm³).","o":["16","9","4","5"],"a":2,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 7 mol/dm³ acid is diluted to 70 cm³. Find the new concentration (mol/dm³).","o":["8","4","10","3"],"a":3,"t":"Solutions","d":"Medium"},{"q":"50 cm³ of 8 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["6","11","9","5"],"a":3,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 4 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["5","2","3","8"],"a":1,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 10 mol/dm³ acid is diluted to 50 cm³. Find the new concentration (mol/dm³).","o":["11","2","50","3"],"a":1,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 10 mol/dm³ acid is diluted to 40 cm³. Find the new concentration (mol/dm³).","o":["6","5","20","11"],"a":1,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 6 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["4","7","12","3"],"a":3,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 10 mol/dm³ acid is diluted to 20 cm³. Find the new concentration (mol/dm³).","o":["6","5","20","11"],"a":1,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 5 mol/dm³ acid is diluted to 50 cm³. Find the new concentration (mol/dm³).","o":["2","8","6","3"],"a":0,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 10 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["11","20","6","5"],"a":3,"t":"Solutions","d":"Medium"},{"q":"50 cm³ of 7 mol/dm³ acid is diluted to 70 cm³. Find the new concentration (mol/dm³).","o":["6","5","8","10"],"a":1,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 9 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["3","27","10","4"],"a":0,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 3 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["4","6","2","3"],"a":2,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 10 mol/dm³ acid is diluted to 50 cm³. Find the new concentration (mol/dm³).","o":["13","9","11","8"],"a":3,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 6 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["7","12","3","4"],"a":2,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 6 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["4","9","5","7"],"a":0,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 5 mol/dm³ acid is diluted to 50 cm³. Find the new concentration (mol/dm³).","o":["8","4","6","5"],"a":1,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 3 mol/dm³ acid is diluted to 30 cm³. Find the new concentration (mol/dm³).","o":["9","1","2","4"],"a":1,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 8 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["9","11","4","3"],"a":3,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 10 mol/dm³ acid is diluted to 50 cm³. Find the new concentration (mol/dm³).","o":["4","11","25","5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 6 mol/dm³ acid is diluted to 30 cm³. Find the new concentration (mol/dm³).","o":["4","9","7","5"],"a":0,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 9 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["7","12","10","6"],"a":3,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 3 mol/dm³ acid is diluted to 30 cm³. Find the new concentration (mol/dm³).","o":["4","3","2","6"],"a":2,"t":"Solutions","d":"Medium"},{"q":"40 cm³ of 2 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["3","2","4","1"],"a":3,"t":"Solutions","d":"Medium"},{"q":"30 cm³ of 8 mol/dm³ acid is diluted to 40 cm³. Find the new concentration (mol/dm³).","o":["11","7","6","9"],"a":2,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 3 mol/dm³ acid is diluted to 60 cm³. Find the new concentration (mol/dm³).","o":["4","2","1","9"],"a":2,"t":"Solutions","d":"Medium"},{"q":"20 cm³ of 8 mol/dm³ acid is diluted to 80 cm³. Find the new concentration (mol/dm³).","o":["3","2","32","9"],"a":1,"t":"Solutions","d":"Medium"},{"q":"10 cm³ of 4 mol/dm³ acid is diluted to 40 cm³. Find the new concentration (mol/dm³).","o":["16","2","5","1"],"a":3,"t":"Solutions","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−3 mol/dm³. What is its pH?","o":["2","4","3","11"],"a":2,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−9 mol/dm³. What is its pH?","o":["5","9","8","10"],"a":1,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−1 mol/dm³. What is its pH?","o":["8","1","2","13"],"a":1,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−12 mol/dm³. What is its pH?","o":["12","13","11","2"],"a":0,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−4 mol/dm³. What is its pH?","o":["3","4","10","5"],"a":1,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−2 mol/dm³. What is its pH?","o":["12","3","2","1"],"a":2,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−8 mol/dm³. What is its pH?","o":["9","7","8","6"],"a":2,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−5 mol/dm³. What is its pH?","o":["6","5","4","9"],"a":1,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−13 mol/dm³. What is its pH?","o":["12","13","14","1"],"a":1,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−11 mol/dm³. What is its pH?","o":["3","11","10","12"],"a":1,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−10 mol/dm³. What is its pH?","o":["11","4","9","10"],"a":3,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"A solution has hydrogen ion concentration 1 × 10^−6 mol/dm³. What is its pH?","o":["8","6","7","5"],"a":1,"t":"Acids, Bases and Salts","d":"Medium"},{"q":"What volume does 6 mole(s) of any gas occupy at s.t.p.? (Molar volume = 22.4 dm³)","o":["134.4 dm³","144 dm³","67.2 dm³","156.8 dm³"],"a":0,"t":"Gas Laws","d":"Easy"},{"q":"What volume does 1 mole(s) of any gas occupy at s.t.p.? (Molar volume = 22.4 dm³)","o":["22.4 dm³","11.2 dm³","24 dm³","44.8 dm³"],"a":0,"t":"Gas Laws","d":"Easy"},{"q":"What volume does 4 mole(s) of any gas occupy at s.t.p.? (Molar volume = 22.4 dm³)","o":["112 dm³","96 dm³","89.6 dm³","44.8 dm³"],"a":2,"t":"Gas Laws","d":"Easy"},{"q":"What volume does 3 mole(s) of any gas occupy at s.t.p.? (Molar volume = 22.4 dm³)","o":["89.6 dm³","33.6 dm³","67.2 dm³","72 dm³"],"a":2,"t":"Gas Laws","d":"Easy"},{"q":"What volume does 2 mole(s) of any gas occupy at s.t.p.? (Molar volume = 22.4 dm³)","o":["22.4 dm³","67.2 dm³","44.8 dm³","48 dm³"],"a":2,"t":"Gas Laws","d":"Easy"},{"q":"What volume does 5 mole(s) of any gas occupy at s.t.p.? (Molar volume = 22.4 dm³)","o":["112 dm³","56 dm³","134.4 dm³","120 dm³"],"a":0,"t":"Gas Laws","d":"Easy"},{"q":"A gas occupies 200 cm³ at 400 K. Find its volume at 600 K at constant pressure.","o":["133.33 cm³","400 cm³","100 cm³","300 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 500 K. Find its volume at 900 K at constant pressure.","o":["55.56 cm³","500 cm³","80 cm³","180 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 400 cm³ at 500 K. Find its volume at 700 K at constant pressure.","o":["285.71 cm³","600 cm³","560 cm³","160 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 400 K. Find its volume at 1000 K at constant pressure.","o":["1350 cm³","360 cm³","1500 cm³","2250 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 200 K. Find its volume at 700 K at constant pressure.","o":["228.57 cm³","1300 cm³","2000 cm³","2800 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 200 K. Find its volume at 700 K at constant pressure.","o":["350 cm³","28.57 cm³","250 cm³","600 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 500 K. Find its volume at 600 K at constant pressure.","o":["240 cm³","40 cm³","166.67 cm³","300 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 400 K. Find its volume at 600 K at constant pressure.","o":["400 cm³","800 cm³","900 cm³","300 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 400 K. Find its volume at 700 K at constant pressure.","o":["457.14 cm³","1400 cm³","600 cm³","1100 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 400 cm³ at 400 K. Find its volume at 800 K at constant pressure.","o":["400 cm³","200 cm³","1200 cm³","800 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 500 K. Find its volume at 700 K at constant pressure.","o":["357.14 cm³","200 cm³","1200 cm³","700 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 500 K. Find its volume at 600 K at constant pressure.","o":["200 cm³","833.33 cm³","1100 cm³","1200 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 500 K. Find its volume at 900 K at constant pressure.","o":["444.44 cm³","1440 cm³","640 cm³","1200 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 200 K. Find its volume at 700 K at constant pressure.","o":["500 cm³","57.14 cm³","700 cm³","900 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 400 cm³ at 500 K. Find its volume at 600 K at constant pressure.","o":["80 cm³","333.33 cm³","500 cm³","480 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 500 K. Find its volume at 900 K at constant pressure.","o":["400 cm³","1400 cm³","277.78 cm³","900 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 400 K. Find its volume at 700 K at constant pressure.","o":["400 cm³","175 cm³","57.14 cm³","75 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 700 cm³ at 400 K. Find its volume at 900 K at constant pressure.","o":["875 cm³","1200 cm³","311.11 cm³","1575 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 400 K. Find its volume at 1000 K at constant pressure.","o":["1200 cm³","320 cm³","2000 cm³","1400 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 300 K. Find its volume at 900 K at constant pressure.","o":["300 cm³","1800 cm³","2700 cm³","1500 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 400 K. Find its volume at 900 K at constant pressure.","o":["750 cm³","266.67 cm³","1100 cm³","1350 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 200 K. Find its volume at 1000 K at constant pressure.","o":["2000 cm³","2500 cm³","1300 cm³","100 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 400 K. Find its volume at 1000 K at constant pressure.","o":["1250 cm³","750 cm³","1100 cm³","200 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 700 cm³ at 300 K. Find its volume at 700 K at constant pressure.","o":["1100 cm³","300 cm³","1633.33 cm³","933 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 300 K. Find its volume at 900 K at constant pressure.","o":["1500 cm³","166.67 cm³","1100 cm³","1000 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 200 K. Find its volume at 1000 K at constant pressure.","o":["20 cm³","400 cm³","900 cm³","500 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 300 K. Find its volume at 700 K at constant pressure.","o":["800 cm³","1000 cm³","257.14 cm³","1400 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 500 K. Find its volume at 900 K at constant pressure.","o":["720 cm³","1300 cm³","500 cm³","1620 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 500 K. Find its volume at 900 K at constant pressure.","o":["1800 cm³","800 cm³","555.56 cm³","1400 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 300 K. Find its volume at 600 K at constant pressure.","o":["900 cm³","600 cm³","1200 cm³","300 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 500 K. Find its volume at 600 K at constant pressure.","o":["960 cm³","666.67 cm³","900 cm³","160 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 200 K. Find its volume at 700 K at constant pressure.","o":["1400 cm³","257.14 cm³","3150 cm³","2250 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 700 cm³ at 500 K. Find its volume at 600 K at constant pressure.","o":["583.33 cm³","800 cm³","840 cm³","140 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 400 K. Find its volume at 700 K at constant pressure.","o":["1575 cm³","514.29 cm³","675 cm³","1200 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 400 K. Find its volume at 900 K at constant pressure.","o":["1000 cm³","222.22 cm³","1125 cm³","625 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 200 K. Find its volume at 900 K at constant pressure.","o":["3500 cm³","222.22 cm³","1700 cm³","4500 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 200 K. Find its volume at 600 K at constant pressure.","o":["200 cm³","1800 cm³","1000 cm³","1200 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 300 K. Find its volume at 800 K at constant pressure.","o":["800 cm³","1100 cm³","112.5 cm³","500 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 400 K. Find its volume at 800 K at constant pressure.","o":["1200 cm³","300 cm³","600 cm³","1000 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 500 K. Find its volume at 700 K at constant pressure.","o":["300 cm³","71.43 cm³","40 cm³","140 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 400 cm³ at 200 K. Find its volume at 700 K at constant pressure.","o":["1000 cm³","1400 cm³","114.29 cm³","900 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 400 K. Find its volume at 1000 K at constant pressure.","o":["40 cm³","150 cm³","250 cm³","700 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 400 K. Find its volume at 600 K at constant pressure.","o":["1350 cm³","450 cm³","600 cm³","1100 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 300 K. Find its volume at 700 K at constant pressure.","o":["2100 cm³","385.71 cm³","1200 cm³","1300 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 200 K. Find its volume at 1000 K at constant pressure.","o":["40 cm³","1000 cm³","800 cm³","1200 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 500 K. Find its volume at 800 K at constant pressure.","o":["480 cm³","600 cm³","187.5 cm³","180 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 400 cm³ at 500 K. Find its volume at 1000 K at constant pressure.","o":["200 cm³","800 cm³","400 cm³","900 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 500 K. Find its volume at 900 K at constant pressure.","o":["1000 cm³","1080 cm³","333.33 cm³","480 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 300 K. Find its volume at 900 K at constant pressure.","o":["300 cm³","33.33 cm³","200 cm³","700 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 300 K. Find its volume at 1000 K at constant pressure.","o":["1600 cm³","270 cm³","3000 cm³","2100 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 300 K. Find its volume at 600 K at constant pressure.","o":["1000 cm³","500 cm³","1300 cm³","2000 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 500 K. Find its volume at 900 K at constant pressure.","o":["160 cm³","111.11 cm³","600 cm³","360 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 300 K. Find its volume at 800 K at constant pressure.","o":["1000 cm³","1100 cm³","225 cm³","1600 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 500 K. Find its volume at 700 K at constant pressure.","o":["420 cm³","500 cm³","214.29 cm³","120 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 500 K. Find its volume at 600 K at constant pressure.","o":["180 cm³","750 cm³","1080 cm³","1000 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 300 K. Find its volume at 800 K at constant pressure.","o":["833 cm³","187.5 cm³","1333.33 cm³","1000 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 200 K. Find its volume at 1000 K at constant pressure.","o":["1200 cm³","1100 cm³","60 cm³","1500 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 400 K. Find its volume at 900 K at constant pressure.","o":["1800 cm³","1000 cm³","355.56 cm³","1300 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 700 cm³ at 300 K. Find its volume at 1000 K at constant pressure.","o":["210 cm³","1633 cm³","2333.33 cm³","1400 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 300 K. Find its volume at 1000 K at constant pressure.","o":["1000 cm³","90 cm³","700 cm³","1300 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 200 K. Find its volume at 1000 K at constant pressure.","o":["120 cm³","1400 cm³","3000 cm³","2400 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 200 K. Find its volume at 800 K at constant pressure.","o":["250 cm³","3000 cm³","1600 cm³","4000 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 500 K. Find its volume at 800 K at constant pressure.","o":["1280 cm³","1100 cm³","480 cm³","500 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 700 cm³ at 500 K. Find its volume at 1000 K at constant pressure.","o":["1200 cm³","700 cm³","350 cm³","1400 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 300 K. Find its volume at 900 K at constant pressure.","o":["2100 cm³","200 cm³","1800 cm³","1200 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 700 cm³ at 200 K. Find its volume at 1000 K at constant pressure.","o":["140 cm³","3500 cm³","1500 cm³","2800 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 200 K. Find its volume at 900 K at constant pressure.","o":["2250 cm³","1750 cm³","111.11 cm³","1200 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 300 K. Find its volume at 700 K at constant pressure.","o":["500 cm³","133 cm³","42.86 cm³","233.33 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 400 K. Find its volume at 700 K at constant pressure.","o":["342.86 cm³","1050 cm³","450 cm³","900 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 300 K. Find its volume at 700 K at constant pressure.","o":["1066 cm³","342.86 cm³","1200 cm³","1866.67 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 200 K. Find its volume at 600 K at constant pressure.","o":["700 cm³","600 cm³","100 cm³","900 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 300 K. Find its volume at 600 K at constant pressure.","o":["800 cm³","250 cm³","500 cm³","1000 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 200 K. Find its volume at 900 K at constant pressure.","o":["44.44 cm³","700 cm³","1100 cm³","900 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 400 K. Find its volume at 800 K at constant pressure.","o":["1300 cm³","1800 cm³","450 cm³","900 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 400 K. Find its volume at 1000 K at constant pressure.","o":["2500 cm³","400 cm³","1600 cm³","1500 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 300 K. Find its volume at 700 K at constant pressure.","o":["1400 cm³","1333 cm³","428.57 cm³","2333.33 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 200 K. Find its volume at 700 K at constant pressure.","o":["285.71 cm³","3500 cm³","2500 cm³","1500 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 300 K. Find its volume at 600 K at constant pressure.","o":["900 cm³","450 cm³","1800 cm³","1200 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 400 K. Find its volume at 600 K at constant pressure.","o":["300 cm³","50 cm³","66.67 cm³","150 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 300 K. Find its volume at 700 K at constant pressure.","o":["266 cm³","85.71 cm³","466.67 cm³","600 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 300 K. Find its volume at 800 K at constant pressure.","o":["700 cm³","75 cm³","333 cm³","533.33 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 400 K. Find its volume at 900 K at constant pressure.","o":["400 cm³","2025 cm³","1400 cm³","1125 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 200 K. Find its volume at 600 K at constant pressure.","o":["66.67 cm³","400 cm³","800 cm³","600 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 400 K. Find its volume at 600 K at constant pressure.","o":["750 cm³","333.33 cm³","250 cm³","700 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 300 K. Find its volume at 900 K at constant pressure.","o":["400 cm³","600 cm³","800 cm³","66.67 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 200 cm³ at 300 K. Find its volume at 1000 K at constant pressure.","o":["466 cm³","900 cm³","60 cm³","666.67 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 300 K. Find its volume at 1000 K at constant pressure.","o":["1666.67 cm³","1166 cm³","150 cm³","1200 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 900 cm³ at 200 K. Find its volume at 900 K at constant pressure.","o":["1600 cm³","200 cm³","4050 cm³","3150 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 300 K. Find its volume at 700 K at constant pressure.","o":["128.57 cm³","1000 cm³","700 cm³","400 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 400 K. Find its volume at 900 K at constant pressure.","o":["375 cm³","133.33 cm³","800 cm³","675 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 500 K. Find its volume at 600 K at constant pressure.","o":["360 cm³","60 cm³","250 cm³","400 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 500 cm³ at 200 K. Find its volume at 700 K at constant pressure.","o":["1250 cm³","142.86 cm³","1000 cm³","1750 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 200 K. Find its volume at 1000 K at constant pressure.","o":["200 cm³","1800 cm³","5000 cm³","4000 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 700 cm³ at 200 K. Find its volume at 800 K at constant pressure.","o":["1300 cm³","2100 cm³","175 cm³","2800 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 600 cm³ at 500 K. Find its volume at 800 K at constant pressure.","o":["960 cm³","360 cm³","375 cm³","900 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 1000 cm³ at 500 K. Find its volume at 1000 K at constant pressure.","o":["1500 cm³","2000 cm³","1000 cm³","500 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 100 cm³ at 200 K. Find its volume at 600 K at constant pressure.","o":["33.33 cm³","200 cm³","500 cm³","300 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 300 K. Find its volume at 1000 K at constant pressure.","o":["2666.67 cm³","240 cm³","1500 cm³","1866 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 800 cm³ at 200 K. Find its volume at 600 K at constant pressure.","o":["1600 cm³","266.67 cm³","2400 cm³","1200 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas occupies 300 cm³ at 500 K. Find its volume at 900 K at constant pressure.","o":["240 cm³","540 cm³","166.67 cm³","700 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 100 kPa. What is its volume at 500 kPa (constant temperature)?","o":["500 cm³","120 cm³","20 cm³","200 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 500 kPa. What is its volume at 400 kPa (constant temperature)?","o":["59 cm³","112.5 cm³","40 cm³","62.5 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 600 kPa. What is its volume at 300 kPa (constant temperature)?","o":["160 cm³","240 cm³","40 cm³","89 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 500 kPa. What is its volume at 400 kPa (constant temperature)?","o":["89 cm³","100 cm³","64 cm³","180 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 20 cm³ at pressure 200 kPa. What is its volume at 500 kPa (constant temperature)?","o":["320 cm³","8 cm³","28 cm³","50 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 200 kPa. What is its volume at 400 kPa (constant temperature)?","o":["100 cm³","25 cm³","75 cm³","250 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 100 kPa. What is its volume at 300 kPa (constant temperature)?","o":["150 cm³","66.67 cm³","250 cm³","16.67 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 400 kPa. What is its volume at 300 kPa (constant temperature)?","o":["120 cm³","67.5 cm³","99 cm³","210 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 600 kPa. What is its volume at 200 kPa (constant temperature)?","o":["49 cm³","160 cm³","120 cm³","13.33 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 600 kPa. What is its volume at 200 kPa (constant temperature)?","o":["99 cm³","360 cm³","270 cm³","30 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 400 kPa. What is its volume at 200 kPa (constant temperature)?","o":["100 cm³","25 cm³","59 cm³","150 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 100 kPa. What is its volume at 300 kPa (constant temperature)?","o":["270 cm³","30 cm³","120 cm³","290 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 600 kPa. What is its volume at 500 kPa (constant temperature)?","o":["96 cm³","176 cm³","66.67 cm³","89 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 100 kPa. What is its volume at 500 kPa (constant temperature)?","o":["480 cm³","16 cm³","400 cm³","96 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 500 kPa. What is its volume at 300 kPa (constant temperature)?","o":["30 cm³","59 cm³","83.33 cm³","133.33 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 600 kPa. What is its volume at 300 kPa (constant temperature)?","o":["49 cm³","120 cm³","20 cm³","80 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 600 kPa. What is its volume at 400 kPa (constant temperature)?","o":["89 cm³","120 cm³","200 cm³","53.33 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 200 kPa. What is its volume at 500 kPa (constant temperature)?","o":["340 cm³","100 cm³","56 cm³","16 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 300 kPa. What is its volume at 500 kPa (constant temperature)?","o":["100 cm³","36 cm³","96 cm³","260 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 500 kPa. What is its volume at 300 kPa (constant temperature)?","o":["69 cm³","160 cm³","100 cm³","36 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 400 kPa. What is its volume at 200 kPa (constant temperature)?","o":["120 cm³","20 cm³","49 cm³","80 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 300 kPa. What is its volume at 500 kPa (constant temperature)?","o":["60 cm³","166.67 cm³","300 cm³","160 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 400 kPa. What is its volume at 500 kPa (constant temperature)?","o":["50 cm³","72 cm³","32 cm³","140 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 100 kPa. What is its volume at 400 kPa (constant temperature)?","o":["22.5 cm³","360 cm³","112.5 cm³","390 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 200 kPa. What is its volume at 400 kPa (constant temperature)?","o":["135 cm³","45 cm³","180 cm³","290 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 20 cm³ at pressure 100 kPa. What is its volume at 300 kPa (constant temperature)?","o":["6.67 cm³","60 cm³","26.67 cm³","220 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 100 kPa. What is its volume at 500 kPa (constant temperature)?","o":["36 cm³","6 cm³","430 cm³","150 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 70 cm³ at pressure 400 kPa. What is its volume at 200 kPa (constant temperature)?","o":["79 cm³","210 cm³","140 cm³","35 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 600 kPa. What is its volume at 400 kPa (constant temperature)?","o":["150 cm³","40 cm³","69 cm³","90 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 300 kPa. What is its volume at 400 kPa (constant temperature)?","o":["80 cm³","45 cm³","160 cm³","105 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 20 cm³ at pressure 600 kPa. What is its volume at 500 kPa (constant temperature)?","o":["16.67 cm³","29 cm³","44 cm³","24 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 100 kPa. What is its volume at 400 kPa (constant temperature)?","o":["10 cm³","50 cm³","160 cm³","340 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 200 kPa. What is its volume at 300 kPa (constant temperature)?","o":["75 cm³","33.33 cm³","83.33 cm³","150 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 70 cm³ at pressure 600 kPa. What is its volume at 500 kPa (constant temperature)?","o":["79 cm³","84 cm³","58.33 cm³","154 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 300 kPa. What is its volume at 500 kPa (constant temperature)?","o":["18 cm³","230 cm³","50 cm³","48 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 500 kPa. What is its volume at 300 kPa (constant temperature)?","o":["240 cm³","54 cm³","150 cm³","99 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 600 kPa. What is its volume at 200 kPa (constant temperature)?","o":["300 cm³","109 cm³","400 cm³","33.33 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 20 cm³ at pressure 400 kPa. What is its volume at 300 kPa (constant temperature)?","o":["29 cm³","15 cm³","46.67 cm³","26.67 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 200 kPa. What is its volume at 500 kPa (constant temperature)?","o":["24 cm³","360 cm³","84 cm³","150 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 70 cm³ at pressure 100 kPa. What is its volume at 300 kPa (constant temperature)?","o":["23.33 cm³","93.33 cm³","270 cm³","210 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 200 kPa. What is its volume at 400 kPa (constant temperature)?","o":["300 cm³","200 cm³","50 cm³","150 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 300 kPa. What is its volume at 500 kPa (constant temperature)?","o":["80 cm³","250 cm³","30 cm³","83.33 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 100 kPa. What is its volume at 300 kPa (constant temperature)?","o":["120 cm³","13.33 cm³","53.33 cm³","240 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 400 kPa. What is its volume at 300 kPa (constant temperature)?","o":["40 cm³","70 cm³","39 cm³","22.5 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 200 kPa. What is its volume at 400 kPa (constant temperature)?","o":["60 cm³","15 cm³","45 cm³","230 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 500 kPa. What is its volume at 400 kPa (constant temperature)?","o":["109 cm³","80 cm³","225 cm³","125 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 100 kPa. What is its volume at 200 kPa (constant temperature)?","o":["120 cm³","30 cm³","160 cm³","90 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 100 kPa. What is its volume at 200 kPa (constant temperature)?","o":["60 cm³","20 cm³","80 cm³","140 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 500 kPa. What is its volume at 200 kPa (constant temperature)?","o":["150 cm³","24 cm³","210 cm³","69 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 70 cm³ at pressure 600 kPa. What is its volume at 200 kPa (constant temperature)?","o":["23.33 cm³","210 cm³","79 cm³","280 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 70 cm³ at pressure 200 kPa. What is its volume at 400 kPa (constant temperature)?","o":["35 cm³","105 cm³","140 cm³","270 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 300 kPa. What is its volume at 200 kPa (constant temperature)?","o":["75 cm³","125 cm³","59 cm³","33.33 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 20 cm³ at pressure 600 kPa. What is its volume at 200 kPa (constant temperature)?","o":["80 cm³","60 cm³","29 cm³","6.67 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 500 kPa. What is its volume at 300 kPa (constant temperature)?","o":["18 cm³","39 cm³","80 cm³","50 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 20 cm³ at pressure 500 kPa. What is its volume at 400 kPa (constant temperature)?","o":["45 cm³","16 cm³","29 cm³","25 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 300 kPa. What is its volume at 400 kPa (constant temperature)?","o":["157.5 cm³","190 cm³","120 cm³","67.5 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 100 kPa. What is its volume at 500 kPa (constant temperature)?","o":["108 cm³","450 cm³","18 cm³","490 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 600 kPa. What is its volume at 400 kPa (constant temperature)?","o":["150 cm³","66.67 cm³","250 cm³","109 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 600 kPa. What is its volume at 400 kPa (constant temperature)?","o":["135 cm³","60 cm³","225 cm³","99 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 300 kPa. What is its volume at 200 kPa (constant temperature)?","o":["150 cm³","66.67 cm³","109 cm³","250 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 500 kPa. What is its volume at 400 kPa (constant temperature)?","o":["72 cm³","202.5 cm³","99 cm³","112.5 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 200 kPa. What is its volume at 500 kPa (constant temperature)?","o":["200 cm³","32 cm³","112 cm³","380 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 100 kPa. What is its volume at 500 kPa (constant temperature)?","o":["10 cm³","450 cm³","60 cm³","250 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 200 kPa. What is its volume at 500 kPa (constant temperature)?","o":["75 cm³","42 cm³","12 cm³","330 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 500 kPa. What is its volume at 400 kPa (constant temperature)?","o":["135 cm³","69 cm³","75 cm³","48 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 500 kPa. What is its volume at 300 kPa (constant temperature)?","o":["166.67 cm³","266.67 cm³","60 cm³","109 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 100 kPa. What is its volume at 200 kPa (constant temperature)?","o":["45 cm³","180 cm³","190 cm³","135 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 500 kPa. What is its volume at 200 kPa (constant temperature)?","o":["12 cm³","105 cm³","75 cm³","39 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 400 kPa. What is its volume at 300 kPa (constant temperature)?","o":["233.33 cm³","75 cm³","109 cm³","133.33 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 100 kPa. What is its volume at 400 kPa (constant temperature)?","o":["400 cm³","200 cm³","125 cm³","25 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 20 cm³ at pressure 400 kPa. What is its volume at 500 kPa (constant temperature)?","o":["120 cm³","16 cm³","36 cm³","25 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 70 cm³ at pressure 500 kPa. What is its volume at 200 kPa (constant temperature)?","o":["245 cm³","175 cm³","79 cm³","28 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 70 cm³ at pressure 300 kPa. What is its volume at 200 kPa (constant temperature)?","o":["175 cm³","46.67 cm³","105 cm³","79 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 500 kPa. What is its volume at 200 kPa (constant temperature)?","o":["200 cm³","89 cm³","280 cm³","32 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 500 kPa. What is its volume at 400 kPa (constant temperature)?","o":["32 cm³","50 cm³","90 cm³","49 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 400 kPa. What is its volume at 300 kPa (constant temperature)?","o":["186.67 cm³","60 cm³","106.67 cm³","89 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 600 kPa. What is its volume at 500 kPa (constant temperature)?","o":["132 cm³","72 cm³","69 cm³","50 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 600 kPa. What is its volume at 500 kPa (constant temperature)?","o":["83.33 cm³","120 cm³","220 cm³","109 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 200 kPa. What is its volume at 400 kPa (constant temperature)?","o":["240 cm³","60 cm³","80 cm³","20 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 400 kPa. What is its volume at 200 kPa (constant temperature)?","o":["180 cm³","99 cm³","45 cm³","270 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 20 cm³ at pressure 400 kPa. What is its volume at 200 kPa (constant temperature)?","o":["10 cm³","29 cm³","60 cm³","40 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 600 kPa. What is its volume at 500 kPa (constant temperature)?","o":["99 cm³","108 cm³","75 cm³","198 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 400 kPa. What is its volume at 200 kPa (constant temperature)?","o":["39 cm³","60 cm³","90 cm³","15 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 100 kPa. What is its volume at 300 kPa (constant temperature)?","o":["10 cm³","90 cm³","40 cm³","230 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 400 kPa. What is its volume at 500 kPa (constant temperature)?","o":["48 cm³","75 cm³","160 cm³","108 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 90 cm³ at pressure 500 kPa. What is its volume at 200 kPa (constant temperature)?","o":["99 cm³","225 cm³","36 cm³","315 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 60 cm³ at pressure 100 kPa. What is its volume at 500 kPa (constant temperature)?","o":["460 cm³","300 cm³","12 cm³","72 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 30 cm³ at pressure 600 kPa. What is its volume at 400 kPa (constant temperature)?","o":["45 cm³","75 cm³","39 cm³","20 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 400 kPa. What is its volume at 500 kPa (constant temperature)?","o":["200 cm³","180 cm³","80 cm³","125 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 600 kPa. What is its volume at 400 kPa (constant temperature)?","o":["59 cm³","33.33 cm³","125 cm³","75 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 500 kPa. What is its volume at 200 kPa (constant temperature)?","o":["40 cm³","109 cm³","350 cm³","250 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 100 kPa. What is its volume at 500 kPa (constant temperature)?","o":["8 cm³","200 cm³","440 cm³","48 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 100 cm³ at pressure 300 kPa. What is its volume at 400 kPa (constant temperature)?","o":["75 cm³","133.33 cm³","175 cm³","200 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 300 kPa. What is its volume at 500 kPa (constant temperature)?","o":["133.33 cm³","280 cm³","48 cm³","128 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 50 cm³ at pressure 400 kPa. What is its volume at 500 kPa (constant temperature)?","o":["40 cm³","150 cm³","90 cm³","62.5 cm³"],"a":0,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 300 kPa. What is its volume at 200 kPa (constant temperature)?","o":["53.33 cm³","120 cm³","89 cm³","200 cm³"],"a":1,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 20 cm³ at pressure 100 kPa. What is its volume at 200 kPa (constant temperature)?","o":["40 cm³","30 cm³","120 cm³","10 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 40 cm³ at pressure 600 kPa. What is its volume at 400 kPa (constant temperature)?","o":["49 cm³","26.67 cm³","100 cm³","60 cm³"],"a":3,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 80 cm³ at pressure 400 kPa. What is its volume at 200 kPa (constant temperature)?","o":["240 cm³","89 cm³","160 cm³","40 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"A gas has volume 70 cm³ at pressure 400 kPa. What is its volume at 500 kPa (constant temperature)?","o":["126 cm³","170 cm³","56 cm³","87.5 cm³"],"a":2,"t":"Gas Laws","d":"Medium"},{"q":"An atom has 4 protons and 7 neutrons. What is its mass number?","o":["12","7","4","11"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 24 protons and 10 neutrons. What is its mass number?","o":["34","15","10","24"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 11 protons and 22 neutrons. What is its mass number?","o":["22","33","12","11"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 14 protons and 11 neutrons. What is its mass number?","o":["11","4","25","14"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 12 protons and 10 neutrons. What is its mass number?","o":["22","3","10","12"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 12 protons and 12 neutrons. What is its mass number?","o":["12","24","25","19"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 12 protons and 34 neutrons. What is its mass number?","o":["23","46","12","34"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 23 protons and 34 neutrons. What is its mass number?","o":["34","57","23","12"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 11 protons and 21 neutrons. What is its mass number?","o":["32","21","33","11"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 15 protons and 26 neutrons. What is its mass number?","o":["15","26","41","12"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 8 protons and 19 neutrons. What is its mass number?","o":["12","8","27","19"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 28 protons and 33 neutrons. What is its mass number?","o":["6","33","61","28"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 26 protons and 13 neutrons. What is its mass number?","o":["39","14","13","26"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 19 protons and 23 neutrons. What is its mass number?","o":["5","23","42","19"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 6 protons and 7 neutrons. What is its mass number?","o":["7","13","2","6"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 6 protons and 33 neutrons. What is its mass number?","o":["28","33","6","39"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 4 protons and 8 neutrons. What is its mass number?","o":["5","4","8","12"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 5 protons and 3 neutrons. What is its mass number?","o":["8","5","9","3"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 5 protons and 15 neutrons. What is its mass number?","o":["5","11","15","20"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 6 protons and 25 neutrons. What is its mass number?","o":["6","20","31","25"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 9 protons and 8 neutrons. What is its mass number?","o":["17","8","9","2"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 17 protons and 8 neutrons. What is its mass number?","o":["8","17","10","25"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 15 protons and 34 neutrons. What is its mass number?","o":["15","34","20","49"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 10 protons and 20 neutrons. What is its mass number?","o":["30","10","11","20"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 23 protons and 22 neutrons. What is its mass number?","o":["22","23","45","2"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 10 protons and 19 neutrons. What is its mass number?","o":["29","10","19","30"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 30 protons and 18 neutrons. What is its mass number?","o":["30","48","13","18"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 25 protons and 17 neutrons. What is its mass number?","o":["42","25","17","9"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 30 protons and 14 neutrons. What is its mass number?","o":["14","30","17","44"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 30 protons and 25 neutrons. What is its mass number?","o":["25","55","6","30"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 4 protons and 4 neutrons. What is its mass number?","o":["4","8","11","9"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 16 protons and 23 neutrons. What is its mass number?","o":["23","39","16","8"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 8 protons and 32 neutrons. What is its mass number?","o":["32","8","25","40"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 3 protons and 7 neutrons. What is its mass number?","o":["3","10","5","7"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 17 protons and 18 neutrons. What is its mass number?","o":["18","35","2","17"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 19 protons and 35 neutrons. What is its mass number?","o":["17","19","35","54"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 16 protons and 19 neutrons. What is its mass number?","o":["19","4","16","35"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 29 protons and 14 neutrons. What is its mass number?","o":["29","43","16","14"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 19 protons and 12 neutrons. What is its mass number?","o":["19","8","12","31"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 9 protons and 31 neutrons. What is its mass number?","o":["23","9","40","31"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 17 protons and 31 neutrons. What is its mass number?","o":["48","15","17","31"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 30 protons and 11 neutrons. What is its mass number?","o":["20","30","41","11"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 29 protons and 33 neutrons. What is its mass number?","o":["33","5","62","29"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 20 protons and 6 neutrons. What is its mass number?","o":["6","20","26","15"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 23 protons and 29 neutrons. What is its mass number?","o":["23","7","52","29"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 19 protons and 11 neutrons. What is its mass number?","o":["30","19","9","11"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 17 protons and 5 neutrons. What is its mass number?","o":["5","22","13","17"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 13 protons and 22 neutrons. What is its mass number?","o":["22","13","10","35"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 29 protons and 13 neutrons. What is its mass number?","o":["17","42","13","29"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 4 protons and 20 neutrons. What is its mass number?","o":["20","17","4","24"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 26 protons and 15 neutrons. What is its mass number?","o":["12","41","15","26"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 30 protons and 5 neutrons. What is its mass number?","o":["35","26","30","5"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 15 protons and 14 neutrons. What is its mass number?","o":["14","2","15","29"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 27 protons and 23 neutrons. What is its mass number?","o":["27","50","5","23"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 8 protons and 35 neutrons. What is its mass number?","o":["43","35","28","8"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 21 protons and 13 neutrons. What is its mass number?","o":["9","13","34","21"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 20 protons and 35 neutrons. What is its mass number?","o":["55","16","20","35"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 30 protons and 6 neutrons. What is its mass number?","o":["25","6","30","36"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 25 protons and 19 neutrons. What is its mass number?","o":["44","7","25","19"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 24 protons and 11 neutrons. What is its mass number?","o":["35","14","11","24"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 24 protons and 19 neutrons. What is its mass number?","o":["24","6","19","43"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 15 protons and 18 neutrons. What is its mass number?","o":["18","4","15","33"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 21 protons and 19 neutrons. What is its mass number?","o":["19","40","21","3"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 23 protons and 30 neutrons. What is its mass number?","o":["30","53","23","8"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 8 protons and 10 neutrons. What is its mass number?","o":["10","3","18","8"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 26 protons and 33 neutrons. What is its mass number?","o":["8","59","26","33"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 15 protons and 16 neutrons. What is its mass number?","o":["15","2","31","16"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 12 protons and 11 neutrons. What is its mass number?","o":["23","2","11","12"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 27 protons and 33 neutrons. What is its mass number?","o":["27","7","33","60"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 14 protons and 25 neutrons. What is its mass number?","o":["14","25","39","12"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 4 protons and 15 neutrons. What is its mass number?","o":["19","4","12","15"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 14 protons and 16 neutrons. What is its mass number?","o":["14","3","16","30"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 13 protons and 18 neutrons. What is its mass number?","o":["6","18","13","31"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 18 protons and 11 neutrons. What is its mass number?","o":["8","11","29","18"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 4 protons and 11 neutrons. What is its mass number?","o":["4","11","15","8"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 23 protons and 9 neutrons. What is its mass number?","o":["23","9","32","15"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 19 protons and 24 neutrons. What is its mass number?","o":["43","19","24","6"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 29 protons and 23 neutrons. What is its mass number?","o":["29","23","7","52"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 4 protons and 6 neutrons. What is its mass number?","o":["10","3","6","4"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 25 protons and 7 neutrons. What is its mass number?","o":["7","19","25","32"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 19 protons and 26 neutrons. What is its mass number?","o":["19","26","8","45"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 21 protons and 32 neutrons. What is its mass number?","o":["53","21","32","12"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 8 protons and 14 neutrons. What is its mass number?","o":["22","8","7","14"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 25 protons and 35 neutrons. What is its mass number?","o":["60","11","35","25"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 23 protons and 3 neutrons. What is its mass number?","o":["26","3","23","21"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 23 protons and 23 neutrons. What is its mass number?","o":["47","23","46","30"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 5 protons and 6 neutrons. What is its mass number?","o":["11","6","2","5"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 18 protons and 22 neutrons. What is its mass number?","o":["5","40","22","18"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 26 protons and 14 neutrons. What is its mass number?","o":["26","40","14","13"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 6 protons and 28 neutrons. What is its mass number?","o":["6","28","23","34"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 13 protons and 28 neutrons. What is its mass number?","o":["28","16","41","13"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 25 protons and 16 neutrons. What is its mass number?","o":["25","10","41","16"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 9 protons and 10 neutrons. What is its mass number?","o":["9","19","2","10"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 6 protons and 13 neutrons. What is its mass number?","o":["8","19","13","6"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 7 protons and 28 neutrons. What is its mass number?","o":["22","35","28","7"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 25 protons and 26 neutrons. What is its mass number?","o":["51","26","25","2"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 17 protons and 33 neutrons. What is its mass number?","o":["51","17","50","33"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 5 protons and 18 neutrons. What is its mass number?","o":["18","5","23","14"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 8 protons and 24 neutrons. What is its mass number?","o":["17","32","8","24"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An atom has 17 protons and 9 neutrons. What is its mass number?","o":["27","9","17","26"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 9 and mass number 63. How many neutrons does it have?","o":["72","63","54","9"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 25 and mass number 40. How many neutrons does it have?","o":["40","25","15","65"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 13 and mass number 60. How many neutrons does it have?","o":["73","60","47","13"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 13 and mass number 56. How many neutrons does it have?","o":["69","43","56","13"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 26 and mass number 41. How many neutrons does it have?","o":["15","26","67","41"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 19 and mass number 52. How many neutrons does it have?","o":["52","71","19","33"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 9 and mass number 47. How many neutrons does it have?","o":["56","9","47","38"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 25 and mass number 52. How many neutrons does it have?","o":["25","52","77","27"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 6 and mass number 63. How many neutrons does it have?","o":["63","57","6","69"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 5 and mass number 49. How many neutrons does it have?","o":["5","54","44","49"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 7 and mass number 42. How many neutrons does it have?","o":["7","35","49","42"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 27 and mass number 63. How many neutrons does it have?","o":["36","27","90","63"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 14 and mass number 64. How many neutrons does it have?","o":["14","78","64","50"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 14 and mass number 52. How many neutrons does it have?","o":["52","14","66","38"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 10 and mass number 62. How many neutrons does it have?","o":["10","72","52","62"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 3 and mass number 68. How many neutrons does it have?","o":["3","68","65","71"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 6 and mass number 58. How many neutrons does it have?","o":["64","6","52","58"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 15 and mass number 44. How many neutrons does it have?","o":["29","59","44","15"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 4 and mass number 41. How many neutrons does it have?","o":["4","37","41","45"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 5 and mass number 70. How many neutrons does it have?","o":["70","75","65","5"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 29 and mass number 43. How many neutrons does it have?","o":["29","14","72","43"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 18 and mass number 40. How many neutrons does it have?","o":["58","40","18","22"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 12 and mass number 49. How many neutrons does it have?","o":["49","61","37","12"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 15 and mass number 62. How many neutrons does it have?","o":["15","47","77","62"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 18 and mass number 55. How many neutrons does it have?","o":["73","55","37","18"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 20 and mass number 48. How many neutrons does it have?","o":["20","48","28","68"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 13 and mass number 48. How many neutrons does it have?","o":["35","61","13","48"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 15 and mass number 64. How many neutrons does it have?","o":["49","15","79","64"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 16 and mass number 47. How many neutrons does it have?","o":["63","16","31","47"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 10 and mass number 42. How many neutrons does it have?","o":["42","32","52","10"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 8 and mass number 57. How many neutrons does it have?","o":["57","49","8","65"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 21 and mass number 66. How many neutrons does it have?","o":["66","87","45","21"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 26 and mass number 52. How many neutrons does it have?","o":["26","78","52","27"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 6 and mass number 35. How many neutrons does it have?","o":["41","35","29","6"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 6 and mass number 43. How many neutrons does it have?","o":["49","6","37","43"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 18 and mass number 69. How many neutrons does it have?","o":["87","18","69","51"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 6 and mass number 65. How many neutrons does it have?","o":["6","65","59","71"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 15 and mass number 32. How many neutrons does it have?","o":["32","47","17","15"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 21 and mass number 58. How many neutrons does it have?","o":["79","37","58","21"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 6 and mass number 45. How many neutrons does it have?","o":["51","39","45","6"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 23 and mass number 44. How many neutrons does it have?","o":["44","23","21","67"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 7 and mass number 40. How many neutrons does it have?","o":["33","7","47","40"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 22 and mass number 34. How many neutrons does it have?","o":["56","34","22","12"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 3 and mass number 33. How many neutrons does it have?","o":["36","3","33","30"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 27 and mass number 65. How many neutrons does it have?","o":["38","92","65","27"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 26 and mass number 51. How many neutrons does it have?","o":["51","77","25","26"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 7 and mass number 44. How many neutrons does it have?","o":["7","37","51","44"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 10 and mass number 53. How many neutrons does it have?","o":["43","63","53","10"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 27 and mass number 45. How many neutrons does it have?","o":["45","27","18","72"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 6 and mass number 64. How many neutrons does it have?","o":["6","58","70","64"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 30 and mass number 53. How many neutrons does it have?","o":["23","53","83","30"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 27 and mass number 41. How many neutrons does it have?","o":["14","41","27","68"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 21 and mass number 45. How many neutrons does it have?","o":["21","24","66","45"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 12 and mass number 48. How many neutrons does it have?","o":["60","12","36","48"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 28 and mass number 70. How many neutrons does it have?","o":["28","98","42","70"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 9 and mass number 57. How many neutrons does it have?","o":["9","66","57","48"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 14 and mass number 32. How many neutrons does it have?","o":["14","32","46","18"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 6 and mass number 52. How many neutrons does it have?","o":["58","46","52","6"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 18 and mass number 42. How many neutrons does it have?","o":["60","18","42","24"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 24 and mass number 58. How many neutrons does it have?","o":["24","34","58","82"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 17 and mass number 41. How many neutrons does it have?","o":["41","24","58","17"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 6 and mass number 34. How many neutrons does it have?","o":["34","6","40","28"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 8 and mass number 54. How many neutrons does it have?","o":["8","54","62","46"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 29 and mass number 53. How many neutrons does it have?","o":["29","82","53","24"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 29 and mass number 42. How many neutrons does it have?","o":["29","71","42","13"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 3 and mass number 55. How many neutrons does it have?","o":["58","3","52","55"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 14 and mass number 62. How many neutrons does it have?","o":["76","14","48","62"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 21 and mass number 61. How many neutrons does it have?","o":["61","40","82","21"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 16 and mass number 54. How many neutrons does it have?","o":["16","54","38","70"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 15 and mass number 39. How many neutrons does it have?","o":["15","24","54","39"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 14 and mass number 60. How many neutrons does it have?","o":["74","46","60","14"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 3 and mass number 67. How many neutrons does it have?","o":["70","64","3","67"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 7 and mass number 41. How many neutrons does it have?","o":["34","48","7","41"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 15 and mass number 40. How many neutrons does it have?","o":["15","40","25","55"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 29 and mass number 47. How many neutrons does it have?","o":["76","18","29","47"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 19 and mass number 66. How many neutrons does it have?","o":["66","19","47","85"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 20 and mass number 70. How many neutrons does it have?","o":["20","50","90","70"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 16 and mass number 36. How many neutrons does it have?","o":["16","20","52","36"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 25 and mass number 49. How many neutrons does it have?","o":["49","24","25","74"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 28 and mass number 37. How many neutrons does it have?","o":["65","28","37","9"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 14 and mass number 68. How many neutrons does it have?","o":["14","54","68","82"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 4 and mass number 42. How many neutrons does it have?","o":["38","42","46","4"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 3 and mass number 42. How many neutrons does it have?","o":["45","42","3","39"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 13 and mass number 51. How many neutrons does it have?","o":["64","38","51","13"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 24 and mass number 61. How many neutrons does it have?","o":["85","61","37","24"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 28 and mass number 40. How many neutrons does it have?","o":["12","28","40","68"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 20 and mass number 46. How many neutrons does it have?","o":["20","66","26","46"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 12 and mass number 43. How many neutrons does it have?","o":["12","31","43","55"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 5 and mass number 50. How many neutrons does it have?","o":["50","5","45","55"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 4 and mass number 38. How many neutrons does it have?","o":["4","34","42","38"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 12 and mass number 57. How many neutrons does it have?","o":["45","12","69","57"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 4 and mass number 66. How many neutrons does it have?","o":["66","4","70","62"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 11 and mass number 69. How many neutrons does it have?","o":["58","69","11","80"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 13 and mass number 59. How many neutrons does it have?","o":["13","59","46","72"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 27 and mass number 38. How many neutrons does it have?","o":["27","65","38","11"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 28 and mass number 34. How many neutrons does it have?","o":["6","28","62","34"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 28 and mass number 38. How many neutrons does it have?","o":["38","28","66","10"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 3 and mass number 36. How many neutrons does it have?","o":["39","3","33","36"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 23 and mass number 34. How many neutrons does it have?","o":["11","23","34","57"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"An element has atomic number 22 and mass number 44. How many neutrons does it have?","o":["44","22","23","66"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of chlorine (atomic number 17)?","o":["2, 8, 7","2, 1","2, 8, 6","2, 6"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of sulphur (atomic number 16)?","o":["2, 8, 5","2, 8, 8, 1","2, 8, 8","2, 8, 6"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of phosphorus (atomic number 15)?","o":["2, 8, 8","2, 8, 5","2, 8, 7","2, 8, 6"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of aluminium (atomic number 13)?","o":["2, 8, 5","2, 8, 1","2, 8","2, 8, 3"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of oxygen (atomic number 8)?","o":["2, 1","2, 8, 7","2, 6","2, 5"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of fluorine (atomic number 9)?","o":["2, 4","2, 7","2, 8, 5","2, 5"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of nitrogen (atomic number 7)?","o":["2, 5","2, 8, 8, 1","2, 8, 8","2, 8, 4"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of potassium (atomic number 19)?","o":["2, 8, 8, 1","2, 5","2, 8","2, 8, 6"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of carbon (atomic number 6)?","o":["2, 7","2, 8, 8, 1","2, 8, 8","2, 4"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of magnesium (atomic number 12)?","o":["2, 8, 5","2, 8, 2","2, 8, 8","2, 5"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of lithium (atomic number 3)?","o":["2, 1","2, 8, 5","2, 7","2, 8, 8, 1"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of sodium (atomic number 11)?","o":["2, 8","2, 6","2, 8, 3","2, 8, 1"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of silicon (atomic number 14)?","o":["2, 8, 1","2, 8, 7","2, 8, 4","2, 8, 2"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of neon (atomic number 10)?","o":["2, 4","2, 8, 4","2, 8, 8, 1","2, 8"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of argon (atomic number 18)?","o":["2, 8, 6","2, 8, 3","2, 4","2, 8, 8"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the electronic configuration of calcium (atomic number 20)?","o":["2, 8, 8, 2","2, 6","2, 8, 7","2, 8, 4"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"In a titration, 21 cm³ of 0.1 mol/dm³ HCl neutralised 23 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.191","0.091","0.183","0.110"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.1 mol/dm³ HCl neutralised 15 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.207","0.107","0.213","0.094"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 18 cm³ of 0.1 mol/dm³ HCl neutralised 14 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.078","0.229","0.129","0.257"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 24 cm³ of 0.3 mol/dm³ HCl neutralised 10 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.720","0.125","1.440","0.540"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.1 mol/dm³ HCl neutralised 21 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.131","0.176","0.076","0.152"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 25 cm³ of 0.2 mol/dm³ HCl neutralised 13 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.392","0.769","0.104","0.385"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 17 cm³ of 0.3 mol/dm³ HCl neutralised 12 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.212","0.425","0.850","0.442"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 22 cm³ of 0.2 mol/dm³ HCl neutralised 12 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.367","0.383","0.109","0.733"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 15 cm³ of 0.4 mol/dm³ HCl neutralised 24 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.640","0.250","0.500","0.463"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 25 cm³ of 0.4 mol/dm³ HCl neutralised 10 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.650","0.160","2.000","1.000"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 18 cm³ of 0.4 mol/dm³ HCl neutralised 16 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.356","0.450","0.900","0.513"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 22 cm³ of 0.3 mol/dm³ HCl neutralised 12 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.164","0.483","1.100","0.550"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 17 cm³ of 0.3 mol/dm³ HCl neutralised 11 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.455","0.927","0.464","0.194"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 10 cm³ of 0.2 mol/dm³ HCl neutralised 16 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.320","0.125","0.263","0.250"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 21 cm³ of 0.4 mol/dm³ HCl neutralised 23 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.365","0.438","0.491","0.730"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 19 cm³ of 0.4 mol/dm³ HCl neutralised 13 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.585","0.546","1.169","0.274"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 17 cm³ of 0.2 mol/dm³ HCl neutralised 22 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.277","0.155","0.309","0.259"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.2 mol/dm³ HCl neutralised 15 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.160","0.250","0.280","0.320"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 25 cm³ of 0.1 mol/dm³ HCl neutralised 18 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.239","0.072","0.139","0.278"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 11 cm³ of 0.2 mol/dm³ HCl neutralised 24 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.092","0.183","0.436","0.246"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 22 cm³ of 0.2 mol/dm³ HCl neutralised 21 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.419","0.305","0.191","0.210"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 22 cm³ of 0.4 mol/dm³ HCl neutralised 19 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.345","0.463","0.926","0.516"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 17 cm³ of 0.1 mol/dm³ HCl neutralised 13 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.076","0.231","0.262","0.131"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 15 cm³ of 0.4 mol/dm³ HCl neutralised 17 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.488","0.453","0.353","0.706"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 24 cm³ of 0.3 mol/dm³ HCl neutralised 17 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.847","0.424","0.212","0.441"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 21 cm³ of 0.4 mol/dm³ HCl neutralised 14 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.267","0.550","1.200","0.600"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 14 cm³ of 0.3 mol/dm³ HCl neutralised 10 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.840","0.420","0.440","0.214"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 23 cm³ of 0.4 mol/dm³ HCl neutralised 18 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["1.022","0.511","0.313","0.528"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 25 cm³ of 0.1 mol/dm³ HCl neutralised 15 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.167","0.060","0.333","0.267"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 23 cm³ of 0.4 mol/dm³ HCl neutralised 11 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.609","0.836","0.191","1.673"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 19 cm³ of 0.4 mol/dm³ HCl neutralised 11 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.573","1.382","0.232","0.691"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 11 cm³ of 0.4 mol/dm³ HCl neutralised 24 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.446","0.367","0.183","0.873"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 21 cm³ of 0.4 mol/dm³ HCl neutralised 15 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["1.120","0.560","0.540","0.286"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.3 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.240","0.480","0.380","0.375"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 13 cm³ of 0.1 mol/dm³ HCl neutralised 25 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.192","0.152","0.052","0.104"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 10 cm³ of 0.3 mol/dm³ HCl neutralised 13 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.377","0.390","0.462","0.231"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 11 cm³ of 0.2 mol/dm³ HCl neutralised 16 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.269","0.138","0.275","0.291"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 17 cm³ of 0.4 mol/dm³ HCl neutralised 13 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.531","0.523","0.306","1.046"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 20 cm³ of 0.1 mol/dm³ HCl neutralised 22 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.110","0.191","0.182","0.091"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 13 cm³ of 0.2 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.265","0.130","0.260","0.308"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 21 cm³ of 0.2 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.210","0.190","0.305","0.420"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 15 cm³ of 0.4 mol/dm³ HCl neutralised 25 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.667","0.240","0.480","0.460"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 23 cm³ of 0.2 mol/dm³ HCl neutralised 15 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.353","0.307","0.130","0.613"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 21 cm³ of 0.3 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.315","0.286","0.630","0.405"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 25 cm³ of 0.3 mol/dm³ HCl neutralised 10 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.550","1.500","0.120","0.750"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 24 cm³ of 0.1 mol/dm³ HCl neutralised 23 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.096","0.204","0.104","0.209"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 24 cm³ of 0.1 mol/dm³ HCl neutralised 16 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.300","0.067","0.150","0.250"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 24 cm³ of 0.4 mol/dm³ HCl neutralised 19 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.317","0.526","0.505","1.011"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.4 mol/dm³ HCl neutralised 11 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.873","0.509","0.436","0.367"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.3 mol/dm³ HCl neutralised 18 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.367","0.200","0.450","0.400"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.3 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.360","0.500","0.180","0.280"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 20 cm³ of 0.2 mol/dm³ HCl neutralised 17 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.471","0.235","0.318","0.170"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 11 cm³ of 0.2 mol/dm³ HCl neutralised 22 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.400","0.250","0.100","0.200"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 25 cm³ of 0.4 mol/dm³ HCl neutralised 16 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.556","0.625","1.250","0.256"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 14 cm³ of 0.2 mol/dm³ HCl neutralised 15 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.373","0.187","0.293","0.214"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 24 cm³ of 0.3 mol/dm³ HCl neutralised 11 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.655","1.309","0.137","0.518"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.4 mol/dm³ HCl neutralised 17 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.282","0.565","0.471","0.567"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.2 mol/dm³ HCl neutralised 11 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.138","0.582","0.345","0.291"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 13 cm³ of 0.3 mol/dm³ HCl neutralised 23 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.339","0.531","0.170","0.357"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.2 mol/dm³ HCl neutralised 14 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.314","0.457","0.175","0.229"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.4 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.500","0.320","0.640","0.480"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.1 mol/dm³ HCl neutralised 16 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.175","0.133","0.075","0.150"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 21 cm³ of 0.4 mol/dm³ HCl neutralised 11 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.210","0.591","1.527","0.764"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 23 cm³ of 0.1 mol/dm³ HCl neutralised 25 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.109","0.092","0.192","0.184"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 14 cm³ of 0.2 mol/dm³ HCl neutralised 13 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.215","0.186","0.431","0.308"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 10 cm³ of 0.1 mol/dm³ HCl neutralised 19 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.190","0.153","0.053","0.105"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 20 cm³ of 0.3 mol/dm³ HCl neutralised 13 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.195","0.454","0.462","0.923"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 15 cm³ of 0.4 mol/dm³ HCl neutralised 11 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.545","0.536","1.091","0.293"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.1 mol/dm³ HCl neutralised 19 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.084","0.119","0.168","0.184"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 22 cm³ of 0.2 mol/dm³ HCl neutralised 15 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.347","0.136","0.293","0.587"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 25 cm³ of 0.4 mol/dm³ HCl neutralised 23 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.870","0.368","0.435","0.509"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 10 cm³ of 0.1 mol/dm³ HCl neutralised 23 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.230","0.143","0.043","0.087"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 24 cm³ of 0.2 mol/dm³ HCl neutralised 23 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.192","0.304","0.417","0.209"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 23 cm³ of 0.1 mol/dm³ HCl neutralised 14 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.164","0.061","0.329","0.264"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 14 cm³ of 0.3 mol/dm³ HCl neutralised 19 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.221","0.407","0.374","0.442"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 13 cm³ of 0.4 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.465","0.260","0.615","0.520"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 22 cm³ of 0.2 mol/dm³ HCl neutralised 10 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.440","0.880","0.420","0.091"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 23 cm³ of 0.1 mol/dm³ HCl neutralised 11 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.418","0.309","0.048","0.209"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 15 cm³ of 0.1 mol/dm³ HCl neutralised 14 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.107","0.214","0.207","0.093"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 20 cm³ of 0.2 mol/dm³ HCl neutralised 12 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.120","0.333","0.667","0.367"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 25 cm³ of 0.4 mol/dm³ HCl neutralised 18 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.556","0.539","0.288","1.111"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 18 cm³ of 0.4 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.360","0.444","0.720","0.490"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 13 cm³ of 0.4 mol/dm³ HCl neutralised 14 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.743","0.371","0.431","0.493"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 20 cm³ of 0.1 mol/dm³ HCl neutralised 21 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.190","0.095","0.195","0.105"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 23 cm³ of 0.4 mol/dm³ HCl neutralised 13 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["1.415","0.226","0.708","0.577"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 24 cm³ of 0.4 mol/dm³ HCl neutralised 21 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.514","0.350","0.457","0.914"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.4 mol/dm³ HCl neutralised 10 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.333","0.520","0.960","0.480"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.2 mol/dm³ HCl neutralised 10 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.360","0.640","0.125","0.320"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 18 cm³ of 0.1 mol/dm³ HCl neutralised 16 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.213","0.113","0.225","0.089"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 15 cm³ of 0.3 mol/dm³ HCl neutralised 24 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.480","0.188","0.375","0.362"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 11 cm³ of 0.4 mol/dm³ HCl neutralised 15 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.545","0.473","0.587","0.293"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.1 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.160","0.167","0.060","0.120"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.4 mol/dm³ HCl neutralised 18 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.711","0.489","0.450","0.356"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.3 mol/dm³ HCl neutralised 17 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.425","0.212","0.371","0.424"],"a":1,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 12 cm³ of 0.2 mol/dm³ HCl neutralised 20 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.120","0.260","0.333","0.240"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 11 cm³ of 0.1 mol/dm³ HCl neutralised 14 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.157","0.179","0.079","0.127"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 23 cm³ of 0.2 mol/dm³ HCl neutralised 24 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.192","0.296","0.383","0.209"],"a":0,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 16 cm³ of 0.2 mol/dm³ HCl neutralised 22 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.275","0.273","0.145","0.291"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 13 cm³ of 0.4 mol/dm³ HCl neutralised 23 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.457","0.452","0.708","0.226"],"a":3,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"In a titration, 10 cm³ of 0.4 mol/dm³ HCl neutralised 23 cm³ of NaOH solution (HCl + NaOH → NaCl + H₂O). Find the concentration of the NaOH (mol/dm³).","o":["0.443","0.920","0.174","0.348"],"a":2,"t":"Acids, Bases and Salts","d":"Hard"},{"q":"Calculate the percentage by mass of Mg in MgO. (O = 16, Mg = 24)","o":["60.0%","30.0%","40.0%","70.0%"],"a":0,"t":"Mole Concept","d":"Hard"},{"q":"Calculate the percentage by mass of H in HCl. (H = 1, Cl = 35.5)","o":["97.3%","2.7%","12.7%","1.4%"],"a":1,"t":"Mole Concept","d":"Hard"},{"q":"Calculate the percentage by mass of Ca in CaCO₃. (C = 12, O = 16, Ca = 40)","o":["40.0%","60.0%","50.0%","20.0%"],"a":0,"t":"Mole Concept","d":"Hard"},{"q":"Calculate the percentage by mass of N in NH₃. (H = 1, N = 14)","o":["82.4%","17.6%","41.2%","92.4%"],"a":0,"t":"Mole Concept","d":"Hard"},{"q":"Calculate the percentage by mass of Na in NaOH. (H = 1, O = 16, Na = 23)","o":["42.5%","57.5%","67.5%","28.7%"],"a":1,"t":"Mole Concept","d":"Hard"},{"q":"Calculate the percentage by mass of C in CO₂. (C = 12, O = 16)","o":["72.7%","37.3%","13.6%","27.3%"],"a":3,"t":"Mole Concept","d":"Hard"},{"q":"Calculate the percentage by mass of H in H₂O. (H = 1, O = 16)","o":["21.1%","11.1%","88.9%","5.6%"],"a":1,"t":"Mole Concept","d":"Hard"},{"q":"Calculate the percentage by mass of Na in NaCl. (Na = 23, Cl = 35.5)","o":["60.7%","39.3%","49.3%","19.7%"],"a":1,"t":"Mole Concept","d":"Hard"},{"q":"Calculate the percentage by mass of C in CH₄. (H = 1, C = 12)","o":["85.0%","37.5%","25.0%","75.0%"],"a":3,"t":"Mole Concept","d":"Hard"},{"q":"Calculate the percentage by mass of H in H₂SO₄. (H = 1, O = 16, S = 32)","o":["2.0%","1.0%","98.0%","12.0%"],"a":0,"t":"Mole Concept","d":"Hard"},{"q":"What is the chemical symbol of the element Hydrogen?","o":["H","Cr","Na","Ag"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol H?","o":["Carbon","Aluminium","Sodium","Hydrogen"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Helium?","o":["C","He","Li","Ag"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol He?","o":["Neon","Iodine","Carbon","Helium"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Lithium?","o":["Li","F","He","Hg"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Li?","o":["Magnesium","Zinc","Tin","Lithium"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Beryllium?","o":["Zn","H","Be","Mn"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Be?","o":["Silicon","Iron","Phosphorus","Beryllium"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Boron?","o":["B","Li","Al","Na"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol B?","o":["Boron","Manganese","Neon","Carbon"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Carbon?","o":["Ar","Mn","C","Sn"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol C?","o":["Aluminium","Fluorine","Carbon","Iron"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Nitrogen?","o":["N","O","He","Cu"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol N?","o":["Sulphur","Silicon","Nitrogen","Hydrogen"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Oxygen?","o":["Pb","O","Sn","Hg"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol O?","o":["Sodium","Manganese","Bromine","Oxygen"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Fluorine?","o":["Fe","F","P","Li"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol F?","o":["Oxygen","Boron","Mercury","Fluorine"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Neon?","o":["Ne","Ag","Li","Sn"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Ne?","o":["Nitrogen","Silver","Neon","Argon"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Sodium?","o":["Zn","Ba","P","Na"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Na?","o":["Aluminium","Carbon","Sodium","Lithium"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Magnesium?","o":["Br","Mg","Ca","Si"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Mg?","o":["Aluminium","Lithium","Mercury","Magnesium"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Aluminium?","o":["Pb","Al","Li","Hg"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Al?","o":["Tin","Nickel","Aluminium","Potassium"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Silicon?","o":["Au","Ca","O","Si"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Si?","o":["Silicon","Potassium","Helium","Nitrogen"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Phosphorus?","o":["P","Ag","I","Al"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol P?","o":["Phosphorus","Iron","Carbon","Barium"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Sulphur?","o":["Mg","S","C","K"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol S?","o":["Sulphur","Phosphorus","Fluorine","Zinc"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Chlorine?","o":["B","Au","Na","Cl"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Cl?","o":["Silicon","Chlorine","Calcium","Manganese"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Argon?","o":["Ar","S","H","Li"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Ar?","o":["Nitrogen","Fluorine","Argon","Silver"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Potassium?","o":["H","Ba","K","Ar"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol K?","o":["Silver","Potassium","Oxygen","Beryllium"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Calcium?","o":["Ca","C","K","Mg"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Ca?","o":["Neon","Nitrogen","Calcium","Carbon"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Iron?","o":["B","S","F","Fe"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Fe?","o":["Iron","Sulphur","Iodine","Chromium"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Copper?","o":["Na","Be","Cu","Ne"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Cu?","o":["Oxygen","Iodine","Copper","Chlorine"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Zinc?","o":["Zn","Ni","Be","Pb"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Zn?","o":["Zinc","Argon","Iodine","Aluminium"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Silver?","o":["Ca","Cl","Ag","Mn"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Ag?","o":["Silver","Mercury","Beryllium","Sulphur"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Gold?","o":["Be","I","Au","O"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Au?","o":["Copper","Silver","Gold","Tin"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Mercury?","o":["Hg","Cr","Sn","Cl"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Hg?","o":["Calcium","Tin","Mercury","Manganese"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Lead?","o":["I","O","Br","Pb"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Pb?","o":["Aluminium","Lead","Iodine","Zinc"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Tin?","o":["Ne","Sn","Cr","Mg"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Sn?","o":["Mercury","Iron","Tin","Sodium"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Manganese?","o":["Mn","Ba","I","S"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Mn?","o":["Argon","Nickel","Phosphorus","Manganese"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Chromium?","o":["Mn","Hg","K","Cr"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Cr?","o":["Chromium","Oxygen","Hydrogen","Nickel"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Nickel?","o":["Ni","Ar","H","Fe"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Ni?","o":["Nickel","Barium","Hydrogen","Beryllium"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Barium?","o":["Ba","Br","Zn","I"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Ba?","o":["Carbon","Barium","Tin","Oxygen"],"a":1,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Iodine?","o":["P","K","I","Cl"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol I?","o":["Iodine","Boron","Potassium","Nitrogen"],"a":0,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the chemical symbol of the element Bromine?","o":["Ni","Mn","Hg","Br"],"a":3,"t":"Elements and Symbols","d":"Easy"},{"q":"Which element has the symbol Br?","o":["Silver","Phosphorus","Bromine","Magnesium"],"a":2,"t":"Elements and Symbols","d":"Easy"},{"q":"What is the atomic number of Hydrogen?","o":["17","1","19","18"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 1?","o":["Fluorine","Aluminium","Phosphorus","Hydrogen"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Helium?","o":["16","2","7","11"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 2?","o":["Aluminium","Magnesium","Silicon","Helium"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Lithium?","o":["3","1","12","2"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 3?","o":["Phosphorus","Chlorine","Lithium","Fluorine"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Carbon?","o":["12","15","19","6"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 6?","o":["Neon","Helium","Carbon","Silicon"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Nitrogen?","o":["11","20","12","7"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 7?","o":["Nitrogen","Potassium","Sodium","Hydrogen"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Oxygen?","o":["15","8","12","17"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 8?","o":["Fluorine","Oxygen","Carbon","Chlorine"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Fluorine?","o":["11","14","9","6"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 9?","o":["Fluorine","Silicon","Argon","Potassium"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Neon?","o":["8","10","3","11"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 10?","o":["Aluminium","Neon","Nitrogen","Hydrogen"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Sodium?","o":["17","11","12","13"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 11?","o":["Fluorine","Phosphorus","Calcium","Sodium"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Magnesium?","o":["12","20","6","8"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 12?","o":["Magnesium","Sulphur","Silicon","Calcium"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Aluminium?","o":["1","13","9","19"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 13?","o":["Aluminium","Oxygen","Sodium","Helium"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Silicon?","o":["20","17","14","10"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 14?","o":["Silicon","Magnesium","Aluminium","Phosphorus"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Phosphorus?","o":["12","15","2","13"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 15?","o":["Nitrogen","Phosphorus","Oxygen","Fluorine"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Sulphur?","o":["9","3","14","16"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 16?","o":["Sodium","Sulphur","Helium","Carbon"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Chlorine?","o":["17","14","12","10"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 17?","o":["Aluminium","Chlorine","Hydrogen","Fluorine"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Argon?","o":["20","2","13","18"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 18?","o":["Sodium","Aluminium","Helium","Argon"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Potassium?","o":["6","7","19","18"],"a":2,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 19?","o":["Aluminium","Potassium","Lithium","Chlorine"],"a":1,"t":"Atomic Structure","d":"Easy"},{"q":"What is the atomic number of Calcium?","o":["2","16","13","20"],"a":3,"t":"Atomic Structure","d":"Easy"},{"q":"Which element has atomic number 20?","o":["Calcium","Sodium","Carbon","Aluminium"],"a":0,"t":"Atomic Structure","d":"Easy"},{"q":"What is the chemical formula of Quicklime?","o":["HCl","CaO","HNO₃","CaCO₃"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula CaO is","o":["Muriatic acid","Oil of vitriol","Quicklime","Caustic potash"],"a":2,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Slaked lime?","o":["Ca(OH)₂","CaSO₄·2H₂O","NaCl","NH₃"],"a":0,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula Ca(OH)₂ is","o":["Slaked lime","Quicklime","Washing soda","Oil of vitriol"],"a":0,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Limestone?","o":["KOH","NH₃","CuSO₄·5H₂O","CaCO₃"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula CaCO₃ is","o":["Oil of vitriol","Laughing gas","Limestone","Baking soda"],"a":2,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Caustic soda?","o":["CaCO₃","NaHCO₃","H₂SO₄","NaOH"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula NaOH is","o":["Common salt","Caustic soda","Quicklime","Aqua fortis"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Washing soda?","o":["NaOH","NaHCO₃","MgSO₄·7H₂O","Na₂CO₃·10H₂O"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula Na₂CO₃·10H₂O is","o":["Caustic soda","Caustic potash","Limestone","Washing soda"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Baking soda?","o":["Na₂CO₃·10H₂O","CuSO₄·5H₂O","CaSO₄·2H₂O","NaHCO₃"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula NaHCO₃ is","o":["Green vitriol","Milk of magnesia","Baking soda","Blue vitriol"],"a":2,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Common salt?","o":["Na₂CO₃·10H₂O","CaCO₃","NaCl","KOH"],"a":2,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula NaCl is","o":["Blue vitriol","Washing soda","Muriatic acid","Common salt"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Marsh gas (natural gas)?","o":["H₂SO₄","NaOH","Ca(OH)₂","CH₄"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula CH₄ is","o":["Ammonia gas","Laughing gas","Milk of magnesia","Marsh gas (natural gas)"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Laughing gas?","o":["NaOH","N₂O","CH₄","HCl"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula N₂O is","o":["Common salt","Caustic potash","Limestone","Laughing gas"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Blue vitriol?","o":["CaSO₄·2H₂O","CuSO₄·5H₂O","CaCO₃","FeSO₄·7H₂O"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula CuSO₄·5H₂O is","o":["Common salt","Blue vitriol","Quicklime","Green vitriol"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Epsom salt?","o":["MgSO₄·7H₂O","N₂O","KOH","NaHCO₃"],"a":0,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula MgSO₄·7H₂O is","o":["Epsom salt","Green vitriol","Marsh gas (natural gas)","Limestone"],"a":0,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Gypsum?","o":["NaCl","N₂O","CaSO₄·2H₂O","NaHCO₃"],"a":2,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula CaSO₄·2H₂O is","o":["Blue vitriol","Laughing gas","Green vitriol","Gypsum"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Milk of magnesia?","o":["CaO","Mg(OH)₂","NaHCO₃","HNO₃"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula Mg(OH)₂ is","o":["Caustic potash","Milk of magnesia","Slaked lime","Caustic soda"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Caustic potash?","o":["NaHCO₃","CaO","KOH","Ca(OH)₂"],"a":2,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula KOH is","o":["Quicklime","Caustic potash","Aqua fortis","Baking soda"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Ammonia gas?","o":["CaO","NH₃","Ca(OH)₂","CuSO₄·5H₂O"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula NH₃ is","o":["Caustic potash","Marsh gas (natural gas)","Ammonia gas","Quicklime"],"a":2,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Green vitriol?","o":["FeSO₄·7H₂O","H₂SO₄","CH₄","NaHCO₃"],"a":0,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula FeSO₄·7H₂O is","o":["Green vitriol","Common salt","Marsh gas (natural gas)","Oil of vitriol"],"a":0,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Oil of vitriol?","o":["CaSO₄·2H₂O","CuSO₄·5H₂O","MgSO₄·7H₂O","H₂SO₄"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula H₂SO₄ is","o":["Caustic soda","Oil of vitriol","Gypsum","Common salt"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Muriatic acid?","o":["NH₃","CuSO₄·5H₂O","MgSO₄·7H₂O","HCl"],"a":3,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula HCl is","o":["Baking soda","Muriatic acid","Epsom salt","Laughing gas"],"a":1,"t":"Common Compounds","d":"Easy"},{"q":"What is the chemical formula of Aqua fortis?","o":["CaO","CuSO₄·5H₂O","HNO₃","CH₄"],"a":2,"t":"Common Compounds","d":"Easy"},{"q":"The common name for the substance with formula HNO₃ is","o":["Slaked lime","Limestone","Aqua fortis","Muriatic acid"],"a":2,"t":"Common Compounds","d":"Easy"},{"q":"What is the confirmatory test for Oxygen?","o":["Relights a glowing splint","Burns with a 'pop' sound when a lighted splint is applied","Bleaches damp litmus paper","Forms dense white fumes with ammonia"],"a":0,"t":"Qualitative Analysis","d":"Medium"},{"q":"Which gas gives this test result: Relights a glowing splint?","o":["Sulphur(IV) oxide","Ammonia","Hydrogen","Oxygen"],"a":3,"t":"Qualitative Analysis","d":"Medium"},{"q":"What is the confirmatory test for Hydrogen?","o":["Burns with a 'pop' sound when a lighted splint is applied","Turns acidified potassium dichromate(VI) from orange to green","Turns anhydrous copper(II) sulphate from white to blue","Relights a glowing splint"],"a":0,"t":"Qualitative Analysis","d":"Medium"},{"q":"Which gas gives this test result: Burns with a 'pop' sound when a lighted splint is applied?","o":["Water vapour","Hydrogen","Chlorine","Ammonia"],"a":1,"t":"Qualitative Analysis","d":"Medium"},{"q":"What is the confirmatory test for Carbon(IV) oxide?","o":["Turns acidified potassium dichromate(VI) from orange to green","Forms dense white fumes with ammonia","Turns lime water milky","Burns with a 'pop' sound when a lighted splint is applied"],"a":2,"t":"Qualitative Analysis","d":"Medium"},{"q":"Which gas gives this test result: Turns lime water milky?","o":["Sulphur(IV) oxide","Chlorine","Water vapour","Carbon(IV) oxide"],"a":3,"t":"Qualitative Analysis","d":"Medium"},{"q":"What is the confirmatory test for Ammonia?","o":["Bleaches damp litmus paper","Turns damp red litmus paper blue","Turns anhydrous copper(II) sulphate from white to blue","Burns with a 'pop' sound when a lighted splint is applied"],"a":1,"t":"Qualitative Analysis","d":"Medium"},{"q":"Which gas gives this test result: Turns damp red litmus paper blue?","o":["Sulphur(IV) oxide","Ammonia","Hydrogen","Chlorine"],"a":1,"t":"Qualitative Analysis","d":"Medium"},{"q":"What is the confirmatory test for Chlorine?","o":["Burns with a 'pop' sound when a lighted splint is applied","Bleaches damp litmus paper","Turns lime water milky","Turns damp red litmus paper blue"],"a":1,"t":"Qualitative Analysis","d":"Medium"},{"q":"Which gas gives this test result: Bleaches damp litmus paper?","o":["Oxygen","Carbon(IV) oxide","Chlorine","Hydrogen"],"a":2,"t":"Qualitative Analysis","d":"Medium"},{"q":"What is the confirmatory test for Hydrogen chloride?","o":["Turns acidified potassium dichromate(VI) from orange to green","Forms dense white fumes with ammonia","Relights a glowing splint","Turns damp red litmus paper blue"],"a":1,"t":"Qualitative Analysis","d":"Medium"},{"q":"Which gas gives this test result: Forms dense white fumes with ammonia?","o":["Water vapour","Oxygen","Hydrogen chloride","Sulphur(IV) oxide"],"a":2,"t":"Qualitative Analysis","d":"Medium"},{"q":"What is the confirmatory test for Sulphur(IV) oxide?","o":["Turns acidified potassium dichromate(VI) from orange to green","Turns anhydrous copper(II) sulphate from white to blue","Turns damp red litmus paper blue","Bleaches damp litmus paper"],"a":0,"t":"Qualitative Analysis","d":"Medium"},{"q":"Which gas gives this test result: Turns acidified potassium dichromate(VI) from orange to green?","o":["Ammonia","Water vapour","Sulphur(IV) oxide","Oxygen"],"a":2,"t":"Qualitative Analysis","d":"Medium"},{"q":"What is the confirmatory test for Water vapour?","o":["Burns with a 'pop' sound when a lighted splint is applied","Turns lime water milky","Bleaches damp litmus paper","Turns anhydrous copper(II) sulphate from white to blue"],"a":3,"t":"Qualitative Analysis","d":"Medium"},{"q":"Which gas gives this test result: Turns anhydrous copper(II) sulphate from white to blue?","o":["Ammonia","Hydrogen","Sulphur(IV) oxide","Water vapour"],"a":3,"t":"Qualitative Analysis","d":"Medium"},{"q":"Which method is best for separating Salt from sea water?","o":["Simple distillation","Fractional distillation","Use of a separating funnel","Evaporation (crystallisation)"],"a":3,"t":"Separation Techniques","d":"Easy"},{"q":"Which method is best for separating Ethanol from water?","o":["Fractional distillation","Filtration","Sublimation","Evaporation (crystallisation)"],"a":0,"t":"Separation Techniques","d":"Easy"},{"q":"Which method is best for separating Iodine from sand?","o":["Fractional distillation","Paper chromatography","Evaporation (crystallisation)","Sublimation"],"a":3,"t":"Separation Techniques","d":"Easy"},{"q":"Which method is best for separating Oil from water?","o":["Simple distillation","Sublimation","Use of a magnet","Use of a separating funnel"],"a":3,"t":"Separation Techniques","d":"Easy"},{"q":"Which method is best for separating Iron filings from sulphur powder?","o":["Use of a magnet","Use of a separating funnel","Fractional distillation","Sublimation"],"a":0,"t":"Separation Techniques","d":"Easy"},{"q":"Which method is best for separating Petroleum into its fractions?","o":["Fractional distillation","Use of a magnet","Sublimation","Simple distillation"],"a":0,"t":"Separation Techniques","d":"Easy"},{"q":"Which method is best for separating Ammonium chloride from sodium chloride?","o":["Simple distillation","Sublimation","Fractional distillation","Use of a magnet"],"a":1,"t":"Separation Techniques","d":"Easy"},{"q":"Which method is best for separating Pure water from salt solution?","o":["Filtration","Simple distillation","Fractional distillation","Use of a separating funnel"],"a":1,"t":"Separation Techniques","d":"Easy"},{"q":"What is the main use of the Burette in the laboratory?","o":["Holds the solution being titrated","Strong heating of solids","Delivers variable volumes of liquid accurately in titration","Holding filter paper during filtration"],"a":2,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Delivers variable volumes of liquid accurately in titration?","o":["Filter funnel","Crucible","Desiccator","Burette"],"a":3,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the main use of the Pipette in the laboratory?","o":["Holds the solution being titrated","Measures a fixed volume of liquid accurately","Cools vapour back into liquid during distillation","Evaporating solutions to crystallise solids"],"a":1,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Measures a fixed volume of liquid accurately?","o":["Condenser","Pipette","Evaporating dish","Desiccator"],"a":1,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the main use of the Conical flask in the laboratory?","o":["Strong heating of solids","Cools vapour back into liquid during distillation","Holds the solution being titrated","Separating immiscible liquids"],"a":2,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Holds the solution being titrated?","o":["Burette","Separating funnel","Condenser","Conical flask"],"a":3,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the main use of the Condenser in the laboratory?","o":["Measuring approximate volumes of liquids","Keeps substances free from moisture","Strong heating of solids","Cools vapour back into liquid during distillation"],"a":3,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Cools vapour back into liquid during distillation?","o":["Separating funnel","Filter funnel","Pipette","Condenser"],"a":3,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the main use of the Desiccator in the laboratory?","o":["Keeps substances free from moisture","Holding filter paper during filtration","Measures a fixed volume of liquid accurately","Evaporating solutions to crystallise solids"],"a":0,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Keeps substances free from moisture?","o":["Desiccator","Evaporating dish","Filter funnel","Separating funnel"],"a":0,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the main use of the Crucible in the laboratory?","o":["Measures a fixed volume of liquid accurately","Holds the solution being titrated","Holding filter paper during filtration","Strong heating of solids"],"a":3,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Strong heating of solids?","o":["Burette","Crucible","Pipette","Desiccator"],"a":1,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the main use of the Separating funnel in the laboratory?","o":["Separating immiscible liquids","Strong heating of solids","Delivers variable volumes of liquid accurately in titration","Measures a fixed volume of liquid accurately"],"a":0,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Separating immiscible liquids?","o":["Separating funnel","Measuring cylinder","Pipette","Conical flask"],"a":0,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the main use of the Evaporating dish in the laboratory?","o":["Keeps substances free from moisture","Evaporating solutions to crystallise solids","Cools vapour back into liquid during distillation","Measuring approximate volumes of liquids"],"a":1,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Evaporating solutions to crystallise solids?","o":["Evaporating dish","Crucible","Desiccator","Measuring cylinder"],"a":0,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the main use of the Measuring cylinder in the laboratory?","o":["Measuring approximate volumes of liquids","Holds the solution being titrated","Strong heating of solids","Delivers variable volumes of liquid accurately in titration"],"a":0,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Measuring approximate volumes of liquids?","o":["Crucible","Measuring cylinder","Filter funnel","Separating funnel"],"a":1,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the main use of the Filter funnel in the laboratory?","o":["Measuring approximate volumes of liquids","Holding filter paper during filtration","Holds the solution being titrated","Delivers variable volumes of liquid accurately in titration"],"a":1,"t":"Laboratory Apparatus","d":"Easy"},{"q":"Which apparatus is used for the following: Holding filter paper during filtration?","o":["Desiccator","Filter funnel","Evaporating dish","Conical flask"],"a":1,"t":"Laboratory Apparatus","d":"Easy"},{"q":"What is the general formula of the Alkanes homologous series?","o":["CₙH₂ₙ₊₁OH","CₙH₂ₙ","CₙH₂ₙ₊₂","CₙH₂ₙ₋₂"],"a":2,"t":"Organic Chemistry","d":"Medium"},{"q":"Which homologous series has the general formula CₙH₂ₙ₊₂?","o":["Alkanoic acids","Alkenes","Alkanes","Alkanols (alcohols)"],"a":2,"t":"Organic Chemistry","d":"Medium"},{"q":"What is the general formula of the Alkenes homologous series?","o":["CₙH₂ₙ","CₙH₂ₙ₊₁OH","CₙH₂ₙ₋₂","CₙH₂ₙ₊₁COOH"],"a":0,"t":"Organic Chemistry","d":"Medium"},{"q":"Which homologous series has the general formula CₙH₂ₙ?","o":["Alkanes","Alkanoic acids","Alkynes","Alkenes"],"a":3,"t":"Organic Chemistry","d":"Medium"},{"q":"What is the general formula of the Alkynes homologous series?","o":["CₙH₂ₙ₋₂","CₙH₂ₙ₊₁OH","CₙH₂ₙ","CₙH₂ₙ₊₂"],"a":0,"t":"Organic Chemistry","d":"Medium"},{"q":"Which homologous series has the general formula CₙH₂ₙ₋₂?","o":["Alkynes","Alkanols (alcohols)","Alkenes","Alkanoic acids"],"a":0,"t":"Organic Chemistry","d":"Medium"},{"q":"What is the general formula of the Alkanols (alcohols) homologous series?","o":["CₙH₂ₙ","CₙH₂ₙ₊₁COOH","CₙH₂ₙ₊₁OH","CₙH₂ₙ₊₂"],"a":2,"t":"Organic Chemistry","d":"Medium"},{"q":"Which homologous series has the general formula CₙH₂ₙ₊₁OH?","o":["Alkenes","Alkanoic acids","Alkanols (alcohols)","Alkynes"],"a":2,"t":"Organic Chemistry","d":"Medium"},{"q":"What is the general formula of the Alkanoic acids homologous series?","o":["CₙH₂ₙ₊₁COOH","CₙH₂ₙ","CₙH₂ₙ₊₂","CₙH₂ₙ₋₂"],"a":0,"t":"Organic Chemistry","d":"Medium"},{"q":"Which homologous series has the general formula CₙH₂ₙ₊₁COOH?","o":["Alkanes","Alkanoic acids","Alkynes","Alkenes"],"a":1,"t":"Organic Chemistry","d":"Medium"},{"q":"Which of these is a noble gas?","o":["Nitrogen","Hydrogen","Argon","Oxygen"],"a":2,"t":"General Chemistry","d":"Medium"},{"q":"The process by which a solid changes directly to gas is","o":["Freezing","Evaporation","Condensation","Sublimation"],"a":3,"t":"General Chemistry","d":"Medium"},{"q":"An element whose atoms have the same atomic number but different mass numbers is called a(n)","o":["Ion","Isomer","Isotope","Allotrope"],"a":2,"t":"General Chemistry","d":"Medium"},{"q":"Which of the following is an alkali metal?","o":["Calcium","Magnesium","Aluminium","Potassium"],"a":3,"t":"General Chemistry","d":"Medium"},{"q":"The type of bond formed when electrons are transferred from one atom to another is","o":["Ionic bond","Metallic bond","Covalent bond","Hydrogen bond"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"The type of bond formed by sharing of electrons is","o":["Dative bond","Covalent bond","Metallic bond","Ionic bond"],"a":1,"t":"General Chemistry","d":"Medium"},{"q":"The pH of a neutral solution at 25°C is","o":["1","14","0","7"],"a":3,"t":"General Chemistry","d":"Medium"},{"q":"Which acid is present in vinegar?","o":["Ethanoic acid","Sulphuric acid","Hydrochloric acid","Citric acid"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"Which gas is evolved when zinc reacts with dilute hydrochloric acid?","o":["Oxygen","Carbon(IV) oxide","Hydrogen","Chlorine"],"a":2,"t":"General Chemistry","d":"Medium"},{"q":"Rusting of iron requires the presence of","o":["Nitrogen and water","Water only","Oxygen only","Oxygen and water"],"a":3,"t":"General Chemistry","d":"Medium"},{"q":"The catalyst used in the Haber process is","o":["Finely divided iron","Vanadium(V) oxide","Nickel","Platinum"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"The catalyst used in the Contact process is","o":["Manganese(IV) oxide","Iron","Platinum","Vanadium(V) oxide"],"a":3,"t":"General Chemistry","d":"Medium"},{"q":"Which of the following is a greenhouse gas?","o":["Helium","Neon","Argon","Carbon(IV) oxide"],"a":3,"t":"General Chemistry","d":"Medium"},{"q":"The most abundant gas in the atmosphere is","o":["Argon","Nitrogen","Carbon(IV) oxide","Oxygen"],"a":1,"t":"General Chemistry","d":"Medium"},{"q":"Which metal is liquid at room temperature?","o":["Mercury","Lead","Tin","Zinc"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"Which element is the most electronegative?","o":["Fluorine","Chlorine","Oxygen","Nitrogen"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"The hardness of water that can be removed by boiling is","o":["Temporary hardness","Soft hardness","Total softness","Permanent hardness"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"Which substance is used to remove permanent hardness of water?","o":["Sodium chloride","Hydrochloric acid","Sodium carbonate","Calcium hydroxide"],"a":2,"t":"General Chemistry","d":"Medium"},{"q":"Alkenes decolourise bromine water because they are","o":["Unsaturated","Ionic","Aromatic","Saturated"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"The process of converting alkenes to alkanes by adding hydrogen is called","o":["Hydrogenation","Polymerisation","Dehydration","Cracking"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"Fermentation of glucose produces","o":["Methane and oxygen","Ethanoic acid and water","Ethene and water","Ethanol and carbon(IV) oxide"],"a":3,"t":"General Chemistry","d":"Medium"},{"q":"Which of the following is a reducing agent?","o":["Oxygen","Hydrogen","Fluorine","Chlorine"],"a":1,"t":"General Chemistry","d":"Medium"},{"q":"In electrolysis the electrode connected to the negative terminal of the battery is the","o":["Cathode","Anode","Electrolyte","Salt bridge"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"During electrolysis of brine, the product at the cathode (inert electrodes, concentrated solution) is","o":["Hydrogen","Oxygen","Chlorine","Sodium"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"Which of the following is used as a fuel and is a product of fractional distillation of petroleum?","o":["Quicklime","Sodium chloride","Ammonia","Kerosene"],"a":3,"t":"General Chemistry","d":"Medium"},{"q":"Group VII elements are called","o":["Halogens","Noble gases","Alkaline earth metals","Alkali metals"],"a":0,"t":"General Chemistry","d":"Medium"},{"q":"Group I elements are called","o":["Transition metals","Halogens","Alkali metals","Noble gases"],"a":2,"t":"General Chemistry","d":"Medium"},{"q":"The number of valence electrons in a chlorine atom is","o":["8","1","7","5"],"a":2,"t":"General Chemistry","d":"Medium"},{"q":"Which of the following is an amphoteric oxide?","o":["Carbon(IV) oxide","Aluminium oxide","Sulphur(IV) oxide","Sodium oxide"],"a":1,"t":"General Chemistry","d":"Medium"},{"q":"Which of the following is the lightest gas?","o":["Nitrogen","Hydrogen","Oxygen","Helium"],"a":1,"t":"General Chemistry","d":"Medium"},{"q":"An exothermic reaction is one in which heat is","o":["Absorbed from the surroundings","Converted into light only","Neither gained nor lost","Released to the surroundings"],"a":3,"t":"General Chemistry","d":"Medium"}]}