Question

The bottles of liquid ammonia are opened after cooling them in ice for sometime. It is because liquid ammonia :

• A. has high vapour pressure at room temperature
• B. is corrosive liquid
• C. is an explosive
• D. brings tears in eyes

Answer 1

The correct option is A has high vapour pressure at room temperature

Liquid ammonia has hydrogen bonding which results in high vapour pressure at room temperature.

The vapour pressure of ammonia at room temperature is very high and hence the ammonia will evaporate unless the vapour pressure is decreased.

Cooling decreases the vapour pressure so that the liquid remains in the same state. Hence, the bottle is cooled before opening.

Option A is correct.