(a) Calcium carbonate and dilute hydrochloric acid.
(b) By upward displacement of air.
(c) CaCO3 + 2HCl → CaCl2 + H2O + CO2.
(d) Laboratory preparation of carbon dioxide
(e) Dilute sulphuric acid reacts with calcium carbonate. But it is not used because the calcium sulfate which is formed during the reaction is insoluble in water. It covers the marble chips and stops the reaction.