Question

The reaction of metal carbonates with acids liberates gas.

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

Answer 1

The correct option is D carbon dioxide

The reaction of metal carbonates with acids leads to the evolution of carbon dioxide gas. Other products obtained are the corresponding salt and water.
$MgC{O}_3+2HCl\to MgC{l}_2+H_{2}O+C{O}_2$

Magnesium carbonate on reaction with hydrochloric acid forms magnesium chloride (salt) along with water and carbon dioxide.