Question

A metal carbonate reacts with a solution X which forms a salt, water and a gas Y. What are X and Y?

Options

• X - Sodium hydroxide, Y - Carbon dioxide

• X - Sodium hydroxide, Y - Hydrogen

• X - Hydrochloric acid, Y - Carbon dioxide

• X - Hydrochloric acid, Y - Hydrogen

Answer 1

X - Hydrochloric acid, Y - Carbon dioxide

Explanation:

Metal carbonates react with acids to form salt, water, and carbon dioxide gas.

Example:

\[\ce{Na2CO3 + 2HCl -> 2NaCl + H2O + CO2}\]

Hence, X = Hydrochloric acid and Y = Carbon dioxide.