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Amongst the following ions which one has...

Amongst the following ions which one has the highest magnetic moment value?
(i) `[Cr(H_(2)O)_(6)]^(3+)`
(ii) `[Fe(H_(2)O)_(6)]^(2+)`
(iii) `[Zn(H_(2)O)_(6)]^(2+)`

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(ii). `Cr^(3+)=3d^(3)` unpaired electrons `=3`
`Fe^(2+)=3d^(6)`, unpaired electrons `=4`
`Zn^(2+)=3d^(10)`, unpaired electrons`=0`
Hence (ii) highest magnetic moment.
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