Question

When an acid reacts with a metal carbonate or metal hydrogen carbonate, it gives the corresponding salt, gas and product. Name the gas and product?

• A. Hydrogen and salt
• B. Carbon dioxide and salt
• C. Carbon dioxide and water
• D. Only carbon dioxide

Answer 1

The correct option is C

Carbon dioxide and water

Explanation for the correct option

(C) Carbon dioxide and water

• When acid reacts with metal carbonates ${\mathrm{MCO}}_3$or metal hydrogen carbonate,${\mathrm{MHCO}}_3$ salt, carbon dioxide and water will be formed.
• It is a neutralization reaction.

$$\begin{gathered} \mathrm{Metal}\mathrm{carbonate}\mathrm{or}\mathrm{metal}\mathrm{hydrogen}\mathrm{carbonate}+\mathrm{Acid}\to \mathrm{Salt}+\mathrm{Carbon}\mathrm{dioxide}+\mathrm{water} \\ \mathrm{Eg}: \\ \mathrm{Metal}\mathrm{carbonate}:{\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to 2\mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ \mathrm{Metal}\mathrm{hydrogen}\mathrm{carbonate}:{\mathrm{NaHCO}}_3\left(\mathrm{aq}\right)+\mathrm{HCl}\left(\mathrm{aq}\right)\to \mathrm{NaCl}\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \end{gathered}$$

Explanation for the incorrect options

Since, Carbon dioxide and water are formed by the reaction between an acid and a metal carbonate or metal hydrogen carbonate. Therefore, options (A), (B) and (D) are incorrect.

Therefore, the correct option is (C) Carbon dioxide and water.