Question

Which of the following gases is formed when solid sodium carbonate reacts with dilute hydrochloric acid?

• A. Hydrogen
• B. Oxygen
• C. Carbon dioxide
• D. Carbon monoxide

Answer 1

The correct option is C

Carbon dioxide

The explanation for the correct option:

• Solid sodium carbonate is taken in a test tube and dilute hydrochloric acid is added to it.
• As soon as solid sodium carbonate comes in contact with dilute hydrochloric acid, a brisk reaction takes place and a colorless gas carbon dioxide is evolved along with sodium chloride and water.
• $\underset{\mathrm{Sodium}\mathrm{carbonate}\mathrm{Hydrohloric}\mathrm{acid}\mathrm{Sodium}\mathrm{chloride}\mathrm{Carbon}\mathrm{dioxide}\mathrm{Water}}{{\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to 2\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$

Hence, C is the correct option.