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NEET Medium

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

A

MnO4−MnO_4^-

B

Cr2O72−Cr_2O_7^{2-}

C

CrO42−CrO_4^{2-}

D

MnO42−MnO_4^{2-}

Step-by-Step Solution

CrO42−⇒Cr6+=[Ar]CrO_4^{2-} \Rightarrow Cr^{6+} = [Ar], Unpaired electron (n) = 0; Diamagnetic. Cr2O72−⇒Cr6+=[Ar]Cr_2O_7^{2-} \Rightarrow Cr^{6+} = [Ar], Unpaired electron (n) = 0; Diamagnetic. MnO42−=Mn6+=[Ar]3d1MnO_4^{2-} = Mn^{6+} = [Ar] 3d^1, Unpaired electron (n) = 1; Paramagnetic. MnO4−=Mn7+=[Ar]MnO_4^- = Mn^{7+} = [Ar], Unpaired electron (n) = 0; Diamagnetic.

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