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Question

The magnetic moments of following, arranged in increasing order will be :

[atomic number of Co = 27]
(1) Co3+ (octahedral complex with a strong field ligand)

(2) Co3+ (octahedral complex with a weak field ligand)

(3) Co2+ (tetrahedral complex)

(4) Co2+ (square planar complex)

256164_6a7d0fee4a954a4a9a326c498eb7021e.png

A
1 > 2 > 3 > 4
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B
2 > 3 > 4 > 1
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C
3 > 2 > 4 > 1
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D
2 > 4 > 3 > 1
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Solution

The correct option is B 2 > 3 > 4 > 1
Para-magnetic moment (due to spin only) can be calculated by the formula
μ,=n(n+2) Bohr magneton (BM), where 'n' is the number of unpaired electron in the complex.
Higher is the number of unpaired electrons, higher will be the magnetic moment.
(1) Co3+ (octahedral complex with a strong field ligand) contains 0 unpaired electrons.
(2) Co3+ (octahedral complex with a weak field ligand) contains 4 unpaired electrons.
(3) Co2+ (tetrahedral complex) contains 3 unpaired electrons.
(4) Co2+ (square planar complex) contains 1 unpaired electron.

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