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Q.

Which of the following ion has three unpaired d-electrons?

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a

Cr3+

b

Mn2+

c

V3+

d

Ti2+

answer is C.

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Detailed Solution

Configuration of Ti is [Ar]3d24s2, therefore Ti2+ is [Ar] 3d2.
Configuration of V is [Ar]3d34s2, therefore V3+ is [Ar] 3d2.
Configuration of Cr is [Ar]3d54s1, therefore Cr3+ is [Ar] 3d3.
Configuration of Mn is [Ar]3d54s2, therefore Ti2+ is [Ar] 3d5.
Thus, only Cr3+ has three unpaired electrons in d orbital according to Hertz's rule.
Hence , option (C) Cr3+ is the correct answer.

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