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The d electron congfiguration of Cr^(2+)...

The d electron congfiguration of `Cr^(2+)` , `Mn^(2+)` , `Fe^(2+)` and `Ni^(2+)` are `3d^(4)` , `3d^(5)` , `3d^(6)` and `3d^(8)` respectively. Which one of the folowing aqua complexes will exhibit the minimum paramagnetic behaviour ?
`(At. No . Cr = 24, Mn = 25, Fe = 26, Ni = 28)`

A

`[Mn(H_(2)O)_(6)]^(2+)`

B

`[Fe(H_(2)O)_(6)]^(2+)`

C

`[Ni(H_(2)O)_(6)]^(2+)`

D

`[Cr(H_(2)O)_(6)]^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
C
`[Fe(H_(2)O)_(6)]^(2+)` no. of unpaired electron `=4`.

Paramagnetic behaviour will be minimum if no. of unpaired electron will be minimum
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