Question

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

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

Answer 1

Answer: (B)

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