When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.

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Solution

Different concentrations of alkali metals in liquid ammonia results in different colours. The dilute solutions are blue in colour due to presence of ammoniated electrons. The concentrated solutions have copper bronze colour as ammoniated metal ions are bound by free electrons.

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When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.

[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).

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