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Question

Which one of the following ions has same number of unpaired electrons as that of V3+ ion?

A
Cr3+
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B
Mn2+
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C
Ni2+
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D
Fe3+
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Solution

The correct option is C Ni2+
V3+[Ar]3d2 [V:[Ar]3d34s2]
unpaired electron= 2
Cr3+[Ar]3d3 3rd element of 3d series
Mn2+[Ar]3d5
Ni2+[Ar]3d82unpairedelectrons
Fe3+[Ar]3d5

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