When sodium is dissolved in liquid ammonia, a solution of deep blue color is obtained. The color of the solution is due to

1. Ammoniated electron

2. Sodium ion

3. Sodium amide

4. Ammoniated sodium ion



Hint: Electron is surrounded by ammonia molecule.

All alkali metal dissolve in liquid NH3 giving highly conducting deep blue solution.
Na+(x+y)NH3[Na(NH3)x]+Ammoniated cation+e(NH3)y-Ammoniated electron
When light fall on these solution, the ammoniated electrons excite in higher energy level by absorbing red wavelengths and so transmitted light is blue.