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Magnetic Nature

The magnetic ...

Question

The magnetic moments of following, arranged in increasing order will be :
[atomic number of Co = 27]
(1) $C o^{3 +}$ (octahedral complex with a strong field ligand)

(2) $C o^{3 +}$ (octahedral complex with a weak field ligand)

(3) $C o^{2 +}$ (tetrahedral complex)

(4) $C o^{2 +}$ (square planar complex)

1 > 2 > 3 > 4

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2 > 3 > 4 > 1

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3 > 2 > 4 > 1

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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
$μ, = \sqrt{n (n + 2)}$ 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) $C o^{3 +}$ (octahedral complex with a strong field ligand) contains 0 unpaired electrons.
(2) $C o^{3 +}$ (octahedral complex with a weak field ligand) contains 4 unpaired electrons.
(3) $C o^{2 +}$ (tetrahedral complex) contains 3 unpaired electrons.
(4) $C o^{2 +}$ (square planar complex) contains 1 unpaired electron.

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Similar questions

Q. Spin only magnetic moments of a

d^{8}

ion in octahedral, square planar, and tetrahedral complexes, respectively, are :

Q. Among the following statements A-D, the incorrect ones are:
A. Octahedral

C o (I I I)

complexes with strong field ligands have high magnetic moments

B. When

Δ_{\circ} < P

the d- electron configuration of

C o (I I I)

in an octahedral complex is

t_{2 g}^{4}, e_{g}^{2}

.

C. Wavelength of light absorbed by

[C o (e n)_{3}]^{3 +}

is lower than that of

[C o F_{6}]^{3 -}

D. If the

Δ_{\circ}

for an octahedral complex of

C o (I I I)

18000 {cm}^{- 1}

, the

Δ_{t}

for its tetrahedral complex with the same ligand will be

16000 {cm}^{- 1}

On the basis of crystal field theory explain why Co(III) forms paramagnetic octahedral complex with weak field ligands whereas it forms diamagnetic octahedral complex with strong field ligands.

The complex, [Ni(CN)₄]^2-, has:

Q. Give the correct of initials T or F for following statements. Use T if statement is true and F if it is false.
(I)

C o (I I I)

is stabilised in presence of weak field ligands, while

C o (I I)

is stabilised in presence of strong field ligand.
(II) Four coordinated complexes of

P d (I I)

and

P t (I I)

are diamagnetic and square planar.
(III)

[N i (C N)_{4}]^{4 -}

ion and

[N i (C O)_{4}]

are diamagnetic tetrahedral and square planar respectively.
(IV)

N i^{2 +}

ion does not form inner orbital octahedral complexes.

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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)