Q.

Which one of the following is the correct order of spin-only magnetic moment for the given complexes?

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a

[Co(H2O)6]2+>[MnCl6]3->[Fe(CN)6]3-

b

[MnCl6]3- > [Co(H2O)6]2+ > [Fe(CN)6]3-

c

[MnCl6]3 ->[Fe(CN)6]3- > [Co(H2O)6]2+

d

[Fe(CN)6]3 -> [Co(H2O)6]2+> [MnCl6]3-

answer is C.

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Detailed Solution

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Cll Weak field ligand (no pairing occurs)
H2OIWeak field ligand (no pairing occurs)
CN Strong field ligand (pairing occurs)
Mn=[Ar]3d54s2
Mn3+=[Ar]3d4 no. of unpairede=4
CO=[Ar]3d74s2
Co2+=[Ar]3d74sno. of unpairede=3

Fe=[Ar]3d64s2
Fe3+=[Ar]3d5

On pairing Question Image

no. of unpaired e– = 1
So, spin magnetic moment =
[MnCl6]3>[Co(H2O)6]2+>[Fe(CN)6]3

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