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The d-electron configuration of Cr^(2+),...

The d-electron configuration of `Cr^(2+), Mn^(2+) , Fe^(2+) , Co^(2+) , ` are `d^4 , d^5, d^6 and d^7 ` respectively. Which one of the following will exhibit minimum paramagnetic behaviour ? (At. No. Cr=24 , Mn=25 , Fe=26, Co=27)

A

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

B

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

C

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

D

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

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The correct Answer is:
D
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