On allowing ammonia solution of s-block metals to stand for a long ...

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On allowing ammonia solution of s-block metals to stand for a long time, blue colour becomes fade. The reason is:-
(A) Formation of \( \mathrm{NH}_{3} \) gas
(B) Formation of metal amide
(C) Cluster formation of metal ions
(D) Formation of metal nitrate
(B)
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