Answer:
(a) \[M+(x+y)N{{H}_{3}}\to
{{M}^{+}}{{(N{{H}_{3}})}_{x}}+{{e}^{-}}\underset{\begin{smallmatrix}
Ammoniated \\
electron
\end{smallmatrix}}{\mathop{{{(N{{H}_{3}})}_{y}}}}\,\]
When ordinary light falls on solution
the ammoniated electrons are excited by absorbing red light and the light transmitted
is blue. This imparts blue colour to the solution.
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