Question

Assertion (A): A bottle of ammonia should be cooled in ice water before opening.

Reason (R): It prevents sudden flushing out of ammonia gas by lowering down the pressure inside the bottle of ammonia.

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 А.

• If A is true, but R is false.

• If both A and R are false.

Answer 1

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

Explanation:

Concentrated ammonia solution creates high vapour pressure inside the bottle at room temperature because the gas is highly volatile. Cooling the bottle in ice water lowers the temperature, which drastically increases the solubility of ammonia gas back into the liquid. This reduces the internal pressure and safely prevents the gas from suddenly splashing or flushing out when the bottle is opened.