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Q.

Which of the following transition metal ions has least magnetic moment?

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a

Co3+

b

Fe3+

c

Cr2+

d

V3+

answer is D.

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Detailed Solution

(a) Valence shell electron configuration of Co3+ is 3d64s0. So has 4 unpaired electrons.(b) Valence shell electron configuration of Fe3+ is 3d54s0. So has 5 unpaired electrons.(c) Valence shell electron configuration of Cr2+ is 3d44s0. So has 4 unpaired electrons.(d) Valence shell electron configuration of V3+ is 3d24s0. So has 2 unpaired electrons.It has least number of unpaired electrons, so it has least magnetic moment.
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