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

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Accepted Answer

$CrO_4^{2-} \Rightarrow Cr^{6+} = [Ar]$, Unpaired electron (n) = 0; Diamagnetic. $Cr_2O_7^{2-} \Rightarrow Cr^{6+} = [Ar]$, Unpaired electron (n) = 0; Diamagnetic. $MnO_4^{2-} = Mn^{6+} = [Ar] 3d^1$, Unpaired electron (n) = 1; Paramagnetic. $MnO_4^- = Mn^{7+} = [Ar]$, Unpaired electron (n) = 0; Diamagnetic.

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