What is responsible for the blue colour of the solution of alkali metali in liquid ammonia? Give chemical equation also.

Explanation

The Solvated electron, `[e(NH_(3))]^(-)` or ammoniated electron is responsible for bios colour of alkali metal solution in `NH_(3)`. It absorbs light from visible region and radiates complementary colour. (in the equation am = amnioniated)
`Na^(+) (am) + e^(-) (am) + NH_(2) (I) to NaNH_(2) (am) + (1)/(2) H_(2) (g)`