Liquid ammonia bottle is cooled before opening the seal. Why?

Liquor ammonia bottles are opened only after cooling. This is because, (a)It is a mild explosive. (b)it generates high vapour pressure, (c)It is lachrymatory, (d)Both (a) and (b)

A piece of metallic sodium is added to liquid ammonia.blue colour is observed.What is the reason for this?

Alkali metals dissolve in liquid ammonia to give blue coloured solutions. Why?

A student is doing an experiment in the laboratory using sodium. Suddenly, a piece of sodium falls into liquid ammonia. (a) What changes can you observe in liquid ammonia? (b) What is the reason for the change? (c) If the solution is kept for a long time it is changed into bronze colour. Why?

A student is doing an experiment in the laboratory using sodium. Suddenly, a piece of sodium falls into liquid ammonia. What is the reason for the change?

When sodium metal dissolves in liquid ammonia, it gives a deep blue coloured solution. Explain the reason.