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Question

Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour?

(Atomic Numbers: Cr=24; Mn=25; Fe=26; Co=27)


A
[Fe(CN)6]3
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B
[Co(CN)6]3
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C
[Cr(CN)6]3
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D
[Mn(CN)6]3
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Solution

The correct option is B [Co(CN)6]3

CN is a strong field ligand, all complexes will be inner orbital i.e d2sp3

a) [Fe(CN)6]3 Fe3+ Configuration [Ar]3d5


1 unpaired electron.

u=3 BM

b) [Co(CN)6]3 Co3+ Configuration [Ar]3d6


0 unpaired electron

u=0 BM

c) [Cr(CN)6]3 Cr+3 Configuration [Ar]3d3


3 unpaired electrons
u=n(n+2)
n= number of electrons

u=15 BM

d) [Mn(CN)6]3 Configuration [Ar]3d4


2 unpaired electrons.

u=2×4=8 BM

Therefore, Co+3 exhibits lowest paramagnetic behavior with strong field ligand.


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