1.

Which of the following has the maximum number of unpaired d electrons ?

Answer»

`Ni^(3+)`
`Cu^(+)`
`ZN^(2+)`
`Fe^(2+)`

Solution : The ELECTRONIC CONFIGURATION of the IONS are given below
`Ni^(3+)to1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(0)3d^(7)`


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