Why alkali metals give a deep blue solution of an alkali metal in liquid ammonia?

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Solution

When an alkali metal is dissolved in liquid ammonia, it results in the formation of a deep blue coloured solution. The ammoniated electrons absorb energy corresponding to a red region of visible light. Therefore, the transmitted light is blue in colour.

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[M (N H_{3})_{n}]^{+}

M =

Statement-2 : Alkali metals in liquid ammonia give solvated species of the type $[M (N H_{3})_{n}]^{+}$ (M =alkali metals).

M + (x + y) N H_{3} \to [M (N H_{3})_{x}]^{2 +} + 2 [e (N H_{3}) y]^{-}

Read the following and select one the correct answer:

Statement I: Alkali metals dissolve in liquid ammonia to give a blue solution

Statement II: Alkali metals dissolve in liquid ammonia to give solvated species of the type $[M (N H_{3})_{n}]^{+}$

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