Question

When sodium is dissolved in lequid ammonia, a solution of deep blue colour is obtained. The colour of the solution is due to
(a) ammoniated electron (b) sodium ion
(c) sodium amide (d) ammoniated sodium ion

Answer 1

Answer: (a) ammoniated electron

All alkali metal dissolves in liquid $N{H}_3$ giving highly conducting deep blue solution,
$Na+(x+y)N{H}_3⟶\left[Na\right(N{H}_3)x{]}^{+}+e(N{H}_3{)}_y^{-}$When light fall on these solutions the ammoniated electrons excite in higher energy level by absorbing red wavelengths and so transmitted light is blue.