Question

Which of the following substance on reaction with an acid produce carbon dioxide gas?

• A. Egg shells
• B. Chalk
• C. Marble
• D. Iron container

Answer 1

Answer: (A), (B), (C)

The correct options are
A Egg shells
B Chalk
C Marble

Egg shells, marbles and chalk are made up of calcium carbonate which is a metal carbonate. Acids react with metal carbonates to give carbon dioxide, water and the metal salt.

For example: When calcium carbonate reacts with hydrochloric acid the products formed are calcium chloride, carbon dioxide and water. This is represented as:

Calcium carbonate + Hydrochloric acid $\to$ Calcium chloride + Carbon dioxide + Water