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Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:

1. ammoniated electrons
2. sodamide
3. sodium-ammonia complex
4. sodium ion-ammonia complex

Correct answer: ammoniated electrons

Solution

Sodium in liquid ammonia ionises to give Na+ and free electrons that are solvated by ammonia. These ammoniated electrons absorb in the visible region and give the characteristic deep blue colour.

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