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  4. Blue colour of alkali and alkaline earth metals in liquid NH3 is due to

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Q. Blue colour of alkali and alkaline earth metals in liquid $NH_{3}$ is due to

NTA AbhyasNTA Abhyas 2022

Solution:

$M \rightarrow M ^{+}+ e ^{-}$
$M ^{+}+ yNH _3 \rightarrow\left[ M \left( NH _3\right)_{ y }\right]^{+}$
$e ^{-}+ x NH _3 \rightarrow eNH _{3_{ x }}{ }^{-} \rightarrow \text { Ammoniated } e ^{-}$
blue coloured.