Question

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

Options

• [MnO₄]^–

• [Co(NH₃)₆]³⁺

• [Fe(CN)₆]³⁺

• [Cr(H₂O)₆]³⁺

Answer 1

[MnO₄]^– 

Explanation:

Oxidation state of Mn in (MnO₄)^–  is +7

MN: [Ar]3d⁵4s²

Mn7+; [Ar], d electrons = zero.