3 Tutor System
Starting just at 265/hour

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

The evolved gas which extinguishes a burning candle is carbon dioxide $$CO_2$$.
During chemical reaction,
Since, one of the compounds formed during this reaction is calcium chloride and as carbon dioxide is formed when dilute hydrochloric acid reacts with a metal carbonate producing effervescence , it means the metal compound is calcium carbonate $$CaCO_3$$. Hence, the compound A is calcium carbonate.

$$CaCO_3 (s) + 2HCl(aq)$$

$$↓$$

$$CaCl_2 (aq) + CO_2 (g) + H_2 O(l)$$