1.

The complex which has no 'd' electrons in the central atom is (Atomic number, Cr= 24, Mn = 25, Fe = 26, Co = 27)

Answer»

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

Solution : Oxidation number of Mn in `[MnO_(4)]^(-)`" is +7 which is achieved by the loss of all `3d^(5)` and `4s^(2)` ELECTRONS
HENCE, (A) is the correct ANSWER.


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