1.

Which of the following has maximum number of unpaired electrons:A. `Fe^(2+)`B. `Fe^(3+)`C. `Se^(3+)`D. `Cu^(2+)`

Answer» `Fe^(+3)=[Ar]_(18)3d^(5)` (5 unpaired electron)
`Fe^(+2)=[Ar]_(18)3d^(6)`(4 unpaired electron)
`Se^(+3)=[Ar]_(18)` (0 unpaired electron)
`Cu^(+2)=[Ar]_(18)3d^(9)` (1 unpaired electron)


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