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

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Solution

The gas produced by the reaction of a metal compound with hydrochloric acid is carbon dioxide, which also extinguishes a burning candle.
Again, one of the products is calcium chloride, which is a salt, indicating that the metal is calcium and the metal compound is calcium carbonate.

Word equation:
Calcium carbonate + Hydrochloric acid $\to$ Calcium chloride + Carbon dioxide + Water
Skeletal equation:
$C a C O_{3} (s) + H C l (a q) \to C a C l_{2} (a q) + C O_{2} (g) + H_{2} O (l)$
Balanced equation:
$C a C O_{3} (s) + 2 H C l (a q) \to C a C l_{2} (a q) + C O_{2} (g) + H_{2} O (l)$

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