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

The alkali metals dissolve in liquid ammonia giving deep blue solutions which are conducting in nature.

$M +(x+y)NH_{3}\rightarrow [M(NH_{3})_{x}]^{+}+[e(NH_{3})_y]^{-}$

The blue colour of the solution is due to the ammoniated electron which absorbs energy in the visible region of light and thus imparts blue colour to the solution. The solutions are paramagnetic.

In concentrated solution, the blue colour changes to bronze colour and becomes diamagnetic

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