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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

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
4
`H_(2)O` is weak field ligands so, the electrons are not paired up.
(1) `n = 4 to mu = 4.85 BM`
(2) `n=5 to mu = 5.92 BM`
(3) `n=4 to mu = 4.85 BM`
(4) `n=2 to mu = 2.8 BM`
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