$A$ metal compound $'A'$ reacts with dilute sulphuric acid to produce a gas which extinguishes a burning candle. Identify the compound $'A'$ and the gas produced. Write a balanced chemical equation for the reaction if one of the compounds formed in the reaction is sodium sulphate.

(A) Compound $'A'$ is sodium carbonate $(Na_{2}CO_{3})$ and the gas evolved is carbon dioxide $(CO_{2})$.
The chemical reaction is as follows:
$Na_{2}CO_{3}(s) + H_{2}SO_{4}(aq) \to Na_{2}SO_{4}(aq) + CO_{2}(g) + H_{2}O(l)$
In this reaction,sodium carbonate reacts with dilute sulphuric acid to form sodium sulphate,water,and carbon dioxide gas. Carbon dioxide does not support combustion,which is why it extinguishes a burning candle.