Which one of the following ions exhibits d-d | vedclass

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(D) To exhibit $d-d$ transition and paramagnetism,the ion must have at least one unpaired electron in its $d$-orbitals.$A$. $CrO_4^{2-}$: $Cr$ is in $

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$MnO_4^{2-}$

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(D) To exhibit $d-d$ transition and paramagnetism,the ion must have at least one unpaired electron in its $d$-orbitals.$A$. $CrO_4^{2-}$: $Cr$ is in $+6$ oxidation state $(3d^0)$. It is diamagnetic and shows no $d-d$ transition.$B$. $Cr_2O_7^{2-}$: $Cr$ is in $+6$ oxidation state $(3d^0)$. It is diamagnetic and shows no $d-d$ transition.$C$. $MnO_4^{-}$: $Mn$ is in $+7$ oxidation state $(3d^0)$. It is diamagnetic and shows no $d-d$ transition.$D$. $MnO_4^{2-}$: $Mn$ is in $+6$ oxidation state $(3d^1)$. It has one unpaired electron,making it paramagnetic,and it exhibits $d-d$ transition.

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

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