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

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MnO₄^-

Cr₂O₂^7-

CrO₄^2-

MnO₄^2-

answer is D.

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Detailed Solution

(i) MnO₄^-
Since Mn has no d (d⁰) electrons, it is in the +7 oxidation state. Therefore, neither a d-d transition nor paramagnetism exist. The charge transfer spectra are what give it its colour.

(ii) CrO₄^2-

Cr has no d (d⁰) electrons since it is in the +6 oxidation state. Therefore, neither a d-d transition nor paramagnetism exist.

(iii) MnO₄^2-
The d-d transition and paramagnetism are caused by Mn being in the +6 oxidation state, which implies it has one d (d¹) electron.

(iv)Cr₂O₂^7-

It has no d (d⁰ ) electrons and is in the +6 oxidation state. There is thus no d-d.

Hence, the correct option is option (D) MnO₄^-

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