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+)`

SOLUTION :Oxidation state of Mn in `[MnO_(4)]^(-)` = +7 , hence it does not have any d-electrons PRESENT in it .
`Mn^(7+) (Z = 25) : [Ar] 4s^(0) 3d^(0)`


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