Chemistry - Complete s-block Question with Solution | TestHub

Alkali metals dissolve in liquid ammonia to give deep blue solutions which are conducting in nature.

The reaction is given by:

$M+(x+y)N{H}_3\to [M(N{H}_3{)}_x{]}^{+}+[e(N{H}_3{)}_y{]}^{-}$

The deep blue colour of the solution is due to the ammoniated electron which absorbs energy in the visible region of light and thus imparts blue colour to the solution.

Answer: deep blue