STANDARD Chemistry Electronic Configuration MCQ Question with Solution

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

A

[MnO₄]⁻

B

[Co(NH₃)₆]³⁺

C

[Fe(CN)₆]³⁻

D

[Cr(H₂O)₆]³⁺

Option A

Oxidation state of Mn in [MnO₄]⁻ is +7, hence it does not have any d-electron present in it. Mn⁷⁺ (Z = 25) : Ar 4s⁰ 3d⁰

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