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Q.

Which of the following has the maximum number of unpaired d-electron?

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a

Zn2+

b

Fe2+

c

Ni2+

d

Cu2+

answer is B.

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Detailed Solution

30Zn+2Ar183d10,so n=0;Fe 2+ 26 Ar183d6,so n=4;  C 29 r [Ar]18 3d9 ,so n=1;Ni +2 28 [Ar]18 3d8 ,so n=2.
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