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The correct order of number of unpaired ...

The correct order of number of unpaired electrons is

A

`Cu^(2+) gt Ni^(2+) gt Cr^(3+) gt Fe^(3+)`

B

`Cr^(3+) gt Fe^(2+) gt Ni^(2+) gt Ce^(2+)`

C

`Fe^(3+) gt Cr^(3+) gt Cu^(2+) gt Ni^(2+)`

D

`Fe^(3+) gt Cr^(3+) gt Ni^(2+) gt Cu^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
D
`Cu^(2+) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(9)` (One unpaired electron)
`Ni^^(2+) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(8)` (Two unpaired electrons)
`Fe^(3+) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(5)` (Five unpaired electrons)
`Cr^(3+) : 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(3)`
(Three unpaired electrons)
`:.` Correct order of unpaired electrons : `Fe^(3+) gt Cr^(3+) gt Ni^(2+) gt Cu^(2+)`
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