Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride

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Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

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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