Answer: Since CO2 gas is liberated and the salt obtain has metal Ca, it implies the reactant metal compound shall be a carbonate i.e. CaCO3
The chemical equation is:
CaCO3 (s) + 2HCl (aq) → CaCl2 (s) + CO2 (g) + H2O (l)
Calcium Carbonate + Hydrochloric Acid → Calcium Chloride + Carbon Dioxide + Water
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