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Question

The complex ion which has no d-electron in the central metal atom is :

A
[MnO4]
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B
[Co(NH3)6]3+
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C
[Fe(CN)6]3
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D
[Cr(H2O)6]3+
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Solution

The correct option is B [MnO4]
Electronic configuration of manganese is [Ar]3d54s2
In MnO4, manganese is in Mn+7.

Electronic configuration of manganese Mn+7 [Ar]3d04s0

Electronic configuration of cobalt is [Ar]3d74s2
Cobalt is in Co+3

Electronic configuration of Co+7 [Ar]3d64s0

Electronic configuration of iron is [Ar]3d64s2
Iron is in Fe+3

Electronic configuration of Fe+3 [Ar]3d54s0

Electronic configuration of chromium is [Ar]3d54s1
Cobalt is in Cr+3

Electronic configuration of Cr+3 [Ar]3d34s0

Hence, option A is correct.

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