Which of the following complex ions has ...

Which of the following complex ions has no 'd' electron(s) in the central metal atom -

`[Cr(H_(2)O)_(6)]^(3+)`

`[Co(NH_(3))_(5)Cl]^(2+)`

`[Fe(CN)_(6)]^(3-)`

`[MnO_(4)]^(-)`

Verified by Experts

The correct Answer is:

Oxidation number of `Mn` in `[MnO_(4)]^(-)` ion is `+7`. In `Mn^(7+)([Ar]3d^(0)4s^(0))` ion there are no d - electrons.

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Which of the following ions can form complexes-

`Al^(3+)`

`Cu^(2+)`

`Cr^(3+)`

`Fe^(2+)`

`[NiCl_(4)]^(2-)`

`[Ni(CN)_(4)]^(2-)`

`[CuCl_(4)]^(2-)`

`[CoF_(6)]^(3-)`

`ClO_(3)^(-)`

`XeF_(4)`

`I_(3)^(-)`

`SF_(4)`