Chemistry · Oct / Nov 2023 · Paper 12 · Question 9

Which reaction would produce the greatest volume of carbon dioxide at room temperature and pressure? [$M_r$: CaCO3, 100; Na2CO3, 106; CuCO3, 124]

1. Aburning 1 g of carbon in excess oxygen C(s) + O2(g) → CO2(g)
2. Bthermal decomposition of 10 g of calcium carbonate in the air CaCO3(s) → CaO(s) + CO2(g)
3. Cadding 10 g of sodium carbonate to an excess of dilute hydrochloric acid Na2CO3(s) + 2HCl(aq) → 2NaCl(aq) + CO2(g) + H2O(l)
4. Dadding 50 cm3 of 1 mol/dm3 sulfuric acid to an excess of copper carbonate CuCO3(s) + H2SO4(aq) → CuSO4(aq) + CO2(g) + H2O(l)

As printed in the paper