Question

Carbon dioxide gas is liberated when HCl acid is added to

• A. calcium carbonate
• B. sodium nitrate
• C. ammonia
• D. sodium sulphate

Answer 1

The correct option is A

calcium carbonate

Carbonate salts release carbon dioxide when they react with HCl. In the given options calcium carbonate will react with hydrochloric acid to release calcium chloride, carbon dioxide and water in the reaction. The reaction involved is:

$2\text{HCl}+{\text{CaCO}}_3\to {\text{CaCl}}_2+{\text{CO}}_2\uparrow +{\text{H}}_2\text{O}$

The reaction of HCl with other options is given below.

Sodium Nitrate: $\text{HCl}+{\text{NaNO}}_3\to \text{NaCl}+{\text{HNO}}_3$

Ammonia: $\text{HCl}+{\text{NH}}_3\to {\text{NH}}_4\text{Cl}$

Sodium sulphate:$2\text{HCl}+{\text{Na}}_2{\text{SO}}_4\to 2\text{NaCl}+{\text{H}}_2{\text{SO}}_4$