Question

before opening d bottle of ammonia , it is cooled. gve reasons.

Answer 1

Ammonia is pressurized and stored as liquid ammonia in bottles. The boiling point of ammonia is -33.34^oC, therefore to prevent the loss of ammonia in the form of vapours, it is cooled as a gas can be kept in the liquid state at high pressure and low temperature. Inside the bottle the pressure is high and cooling leads to decrease in pressure.