Question

When dilute hydrochloric acid reacts with sodium carbonate, the gas liberated is -

• A. hydrogen
• B. carbon dioxide
• C. oxygen
• D. methane

Answer 1

The correct option is B

carbon dioxide

Explanation for Correct option

(B) carbon dioxide:

• Carbon dioxide$\left({\mathrm{CO}}_2\right)$ can be prepared by using sodium carbonate $\left({\mathrm{Na}}_2{\mathrm{CO}}_3\right)$ with dilute hydrochloric acid$\left(\mathrm{HCl}\right)$.
• $\underset{\mathrm{sodium}\mathrm{carbonate}}{{\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)}+\underset{\mathrm{hydrochloric}\mathrm{acid}}{2\mathrm{HCl}\left(\mathrm{aq}\right)}\stackrel{}{\to }\underset{\mathrm{sodium}\mathrm{chloride}}{2\mathrm{NaCl}\left(\mathrm{aq}\right)}+\underset{\mathrm{carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$
• Carbon dioxide$\left({\mathrm{CO}}_2\right)$ is collected in the laboratory preparation by upward displacement of air.