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Q.

which of the following complex is with lowest number of unpaired electron.

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a

[NiF6]2-

b

[Cu(NH3)4]2+

c

[COF6]3-

d

[Fe(EDTA)]-

answer is A.

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Detailed Solution

Ni4+ in [NiF6]2-

Question Image

0-unpaired electron

More positive charge on central atom greater will be CFSE so unpaired electron will be paired.

B : Cu++ in [Cu(NH3)4]2+

Question Image

1- unpaired electron

C : CO3+ in [COF6]3-

Question Image

4-unpaired electron

D : Fe3+ in [Fe(EDTA)]-

Question Image

1- unpaired electron

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