d and f-Block ElementsHard

Question

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

Options

A.

CrO42-

B.

CrO72-

C.

MnO4-

D.

MnO42-

Solution

CrO42-          Cr+6 diamagnetic
Cr2O72-       Cr+6 diamagnetic
MnO4-           Mn+7 diamagnetic
MnO42-        Mn+6 paramagnetic    
unpaired electron is present so d–d transition is possible.

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