Q.

Which of the following has the maximum number of unpaired electrons

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a

Mg2+

b

Ti3+

c

v3+

d

Fe+2

answer is D.

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Detailed Solution

The electronic configuration of the given ions are as follows  12Mg2+=1s2,2s22p6                       (No unpaired electron) 22Ti3+=1s2,2s22p6⋅3s23p63d1    (One unpaired electron) 23V3+=1s2,2s22p63s23p63d2        (Two unpaired electrons) 26Fe2+=1s2,2s22p6,3s23p63d6     (Four unpaired electrons)
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