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Question

An aqueous blue coloured solution of a transition metal nitrate reacts with H2S in acidic medium to give a black precipitate (X), which dissolves in KCN solution forming a clear solution of (Y). The blue solution on reaction with KI in weakly acidic medium becomes intensely brown and produces a white precipitate (Z).

The electron configuration of the transition metal ion is

A
[Ar]3d9
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B
[Ar]3d10
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C
[Kr]4d9
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D
[Kr]4d10
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Solution

The correct options are
A [Ar]3d9
B [Ar]3d10
C [Kr]4d9
The general electronic configuration of transition metals is [Ar]3d1104s12 for first transition series and
[Kr]4d1105s02 for second transition series.
When some electrons are lost, ions are obtained.
Hence, the electronic configurations [Ar]3d9, [Ar]3d10 and [Kr]4d9 refer to transition metal ions.

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