Question

Solve Q. 10 Please!!!!!

Answer 1

An alkali metal dissolves in liquid ammonia giving deep blue solutions which are conducting in nature.
These solutions contain ammoniated cations and ammoniated electrons.
The blue colour of the solution is due to the ammoniated electrons which absorb energy corresponding to red region of the visible light for their excitation to higher energy levels. The transmitted light is blue which imparts blue to colour to the solutions.

Answer 2

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different concentrations of alkali metals in liquid ammonia results in different colours . The dilute solutions of alkali metals in liquid ammonia results in dark blue colour due to the presence of ammoniated electrons .