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  4. The metallic sodium dissolves in liquid ammonia to form a deep blue coloured solution. The deep blue colour is due to formation of :

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Q. The metallic sodium dissolves in liquid ammonia to form a deep blue coloured solution. The deep blue colour is due to formation of :

AIEEEAIEEE 2002The s-Block Elements

Solution:

All alkali metals dissolve in liquid ammonia

$M+(x+y) NH _{3} \rightarrow M^{+}\left( NH _{3}\right)_{x}+e^{-}\left( NH _{3}\right)_{y}$

These electrons are excited to higher energy levels and the absorption of photons occurs in the red region of the spectrum. Thus solution appears blue.