1.

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

Answer»

`[MnO_(4)]^(-)`
`[Co(NH_(3))_(6)]^(3+)`
`[FE(CN)_(6)]^(3-)`
`[Cr(H_(2)O)_(6)]^(3+)`d

Solution :In `MnO_(4)^(-)` the oxidation number of Mn is +7. Thus, `Mn^(7+)` has configuration `[Ar]3d^(0)4s^(0)` as all the electrons (`3d^(5)` and `4s^(2)`) are lost.


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