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

The d electron configurations 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 following aqua complexes will exhibit the minimum paramagnetic behaviour? (At. no. of Cr= 24, Mn= 25, Fe= 26, Ni= 28)

A

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

B

`[Co(H_(2)O))_(6)]^(3+)`

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
`[Co(H_(2)O)_(6)]^(3+)=d^(2)sp^(3)`
low spin, diamagnetic,magntic moment = zero `BM` .
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