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+1 vote
114k views
in Chemistry by (150k points)

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

(1) CrO42-

(2) Cr2O72-

(3) MnO4-

(4) MnO42-

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2 Answers

+1 vote
by (87.2k points)

unpaired electron is present so d–d transition is possible.

0 votes
by (45 points)

MnO42exhibits d-d transition and paramagnetism as well.

CrO42- => Cr6+= [Ar] => Unpaired electrons= 0, Diamagnetic

Cr2O72- => Cr6+= [Ar] => Unpaired electrons= 0, Diamagnetic

MnO4- => Mn7+= [Ar] => Unpaired electrons= 0, Diamagnetic

MnO42- => Mn6+= [Ar]3d1 => Unpaired electrons= 1, Paramagnetic

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