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Q.

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

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a

CrO42-

b

Cr2O72-

c

MnO4-

d

MnO42-

answer is D.

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Detailed Solution

In CrO42-Cr+6(n=0) diamagnetic   In Cr2O72-Cr+6(n=0) diamagnetic  InMnO4-Mn+7(n=0) diamagnetic   In MnO42- Mn+6(n=1)  paramagnetic  In MnO42- ,oneunpairedelectron (n) ispresentin d -orbital  so, d - d transitionispossible.
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