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

Question

Canvas Classes · Accepted Answer

When alkali metals (like Na) dissolve in liquid ammonia:

The electrons are solvated by ammonia molecules to form ammoniated electrons ():

These ammoniated electrons absorb visible light and give the characteristic deep blue colour to the solution. At high concentrations, the solution becomes bronze-coloured (metallic).

Answer: Option (4) — Ammoniated electrons

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