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Which one of the following ions exhibits...

Which one of the following ions exhibits d-d transition and paramagnetism as well ?

A

`CrO_(2)^(2-)`

B

`Cr_(2)O_(7)^(2-)`

C

`MnO_(4)^(2-)`

D

`MnO_(4)^(-)`

Text Solution

Verified by Experts

The correct Answer is:
C
`CrO_(4)^(2-) to Cr^(6+)=[Ar]`
Unpaired electron `(n)=0`, Diamagnetic
`Cr_(2)O_(7)^(2-) to Cr^(6+) =[Ar]`
Unpaired electron `(n)=0` , Diamagnetic
`MnO_(4)^(2-)=Mn^(6+)=[Ar]3d^(1)`
Unpaired electron `(n)=1` , Paramagnetic
`MnO_(4)^(-)=Mn^(7+)=[Ar]`, Diamagnetic
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