Question

Assertion (A): Ammonia gas is dried by passing over quick lime.

Reason (R): Phosphorus pentaoxide is also a drying agent.

Options

• If both A and R are true, and R is the correct explanation of A.

• If both A and R are true, but R is not the correct explanation of A.

• If A is true, but R is false.

• If both A and R are false.

Answer 1

If both A and R are true, but R is not the correct explanation of A.

Explanation:

The assertion is true because basic ammonia gas is dried using quicklime (CaO), which is also basic and does not react with it. The reason is also true because phosphorus pentoxide (P₂O₅) is a well-known drying agent. However, it is not the correct explanation because P₂O₅ is acidic and actually reacts chemically with ammonia instead of drying it.