Question

Assertion (A): Liquid ammonia is used as a refrigerant.

Reason (R): Liquid ammonia is not volatile.

Options

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

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

• If A is true, but R is false.

• If both A and R are false.

Answer 1

If A is true, but R is false.

Explanation:

The assertion is true because liquid ammonia has an exceptionally high latent heat of vaporisation (327 cal/g), making it an excellent refrigerant that absorbs a massive amount of heat as it evaporates. However, the reason is completely false because ammonia is a highly volatile liquid that boils at a very low temperature (−33.34°C).