Ncert Exercises & Solutions

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) {NH}_{3} \to \underset{Ammoniated cation}{{[Na ({NH}_{3}) x]}^{+}} + \underset{Ammoniated electron}{e {({NH}_{3})}_{y}^{-}}

When light fall on these solution, the ammoniated electrons excite in higher energy level by absorbing red wavelengths and so transmitted light is blue.

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