Question

Blue colour of alkali and alkaline earth metals in liquid $N{H}_3$ is due to

• A. ammoniated complex cation
• B. ammoniated $e^{-}$
• C. $d-d$ transition
• D. both $(A)$ $\&$ $(B)$

Answer 1

Answer: (B)

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