Question

Assertion:- Curd is not stored in copper or brass vessels.
Reason:- Curd contains acid which reacts with copper or brass vessels and forms toxic substances.

• A. Both assertion and reason are true and the reason is the correct explanation of assertion.
• B. Both assertion and reason are true but the reason is not the correct explanation of assertion.
• C. Only assertion is correct.
• D. Only reason is correct.

Answer 1

The correct option is A

Both assertion and reason are true and the reason is the correct explanation of assertion.

Metals react with acids to form salts and hydrogen gas.

Lactic acid (${\text{C}}_3{\text{H}}_6{\text{O}}_3$) is present in curd. This acid reacts with metal like copper and brass to form harmful salts and hydrogen gas.

Hence, curd should not be placed in metal vessels.