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Question
Q221) Which of the following has maximum number of unpaired d-electrons?



SOLUTION

N3+ = 4 = 1s2, 2s2 Zero unpaired
Fe2+ = 24 = 1s2, 2s2, 2p6, 3s2, 3p6, 3d6, Four unpaired
Zn+ = 29 = 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d10 1 unpaired
Cu+ = 28 = 1s2, 2s2, 2p6, 3s2, 3p6, 4s0, 3d10 Zero unpaired
Answer:(b)