Why is liquid ammonia bottle first cooled in ice before opening it?

Due to ammoniated cation and ammoniated electron. 

(a) Owing to the random thermal motion of molecules, the alignments of dipoles get disrupted at high temperatures. On cooling, this disruption is reduced. Hence, a paramagnetic sample displays greater...

It is due to condensation of water vapours present in air. Air contains water in the form of vapours, when it comes in contact of cool water bottle, it gets...

(c) evaporation and condensation.

(c) : When water is cooled to form ice, its thermal energy decreases. By mass energy equivalent, mass should decrease.

(c) same part in the water EXPLANATION:   Pushing air inside the bottle will increase the air pressure. When the pressure of air inside the bottle is increased it does not increase the...

(b) Liquid ammonia has high vapour pressure which is lowered down by cooling, otherwise the liquid will bump.

(b) must be unsaturated 

(a) must be saturated 

(c) decrease if it is taken partially out of the liquid (d) be in the vertically upward direction. EXPLANATION:   The force exerted by the liquid on the solid is equal to the volume...