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Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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12 questions

SA-OC-MC-0021 markL1 FoundationCalculatorGas volumes
What volume, in dm3\mathrm{dm^3}, does 0.250.25 mol of oxygen occupy at r.t.p.?

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0012 marksL2 StandardCalculatorReacting masses
CaCO3→CaO+CO2\mathrm{CaCO_3\rightarrow CaO+CO_2}. What mass of CaO\mathrm{CaO} (Mr=56M_r=56) forms from 2525 g of CaCO3\mathrm{CaCO_3} (Mr=100M_r=100)?

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0031 markL2 StandardCalculatorGas volumes
How many moles of gas are in 480 cm3480\ \mathrm{cm^3} at r.t.p.?

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0042 marksL2 StandardCalculatorConcentration
0.100.10 mol of NaOH is dissolved to make 250 cm3250\ \mathrm{cm^3} of solution. Calculate the concentration in mol/dm3\mathrm{mol/dm^3}.

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0052 marksL2 StandardCalculatorConcentration
How many moles of HCl are in 20.0 cm320.0\ \mathrm{cm^3} of 0.50 mol/dm30.50\ \mathrm{mol/dm^3} hydrochloric acid?

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0062 marksL2 StandardCalculatorYield
The theoretical yield of a product is 4040 g; the actual yield is 3030 g. Calculate the percentage yield.

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0092 marksL2 StandardCalculatorYield
A 5.05.0 g sample of impure limestone contains 4.04.0 g of calcium carbonate. Calculate the percentage purity.

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0101 markL2 StandardCalculatorYield
11 mol of N2\mathrm{N_2} is mixed with 22 mol of H2\mathrm{H_2}: N2+3H2→2NH3\mathrm{N_2+3H_2\rightarrow2NH_3}. The limiting reactant is
Choose one option

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0122 marksL2 StandardCalculatorConcentration
Convert 0.50 mol/dm30.50\ \mathrm{mol/dm^3} NaOH (Mr=40M_r=40) into g/dm3\mathrm{g/dm^3}.

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0073 marksL3 ExamCalculatorReacting masses
2Mg+O2→2MgO\mathrm{2Mg+O_2\rightarrow 2MgO}. What mass of MgO\mathrm{MgO} (Mr=40M_r=40) forms when 6.06.0 g of Mg (Ar=24A_r=24) burns completely?

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0083 marksL3 ExamCalculatorGas volumes
CaCO3+2HCl→CaCl2+H2O+CO2\mathrm{CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2}. What volume of CO2\mathrm{CO_2}, in cm3\mathrm{cm^3} at r.t.p., forms from 2.02.0 g of CaCO3\mathrm{CaCO_3} (Mr=100M_r=100)?

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-MC-0113 marksL3 ExamCalculatorConcentration
25.0 cm325.0\ \mathrm{cm^3} of NaOH is neutralised by 12.5 cm312.5\ \mathrm{cm^3} of 0.200 mol/dm30.200\ \mathrm{mol/dm^3} H2SO4\mathrm{H_2SO_4}. H2SO4+2NaOH→Na2SO4+2H2O\mathrm{H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O}. Calculate c(NaOH)c(\mathrm{NaOH}) in mol/dm3\mathrm{mol/dm^3}.

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Salam Academy Original Practice · Proposed mark scheme