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Question

The correct order of the calculated spin-only magnetic moments of complexes A to D is:

(A) Ni(CO)4
(B) [Ni(H2O)6]Cl2
(C) Na2[Ni(CN)4]
(D) PdCl2(PPh3)2


A

(C) < (D) < (B) < (A)

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B

(A) ≈ (C) ≈ (D) < (B)

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C

(A) ≈ (C)<(B) ≈ (D)

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D

(C) ≈ (D) < (B) < (A)

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Solution

The correct option is B

(A) ≈ (C) ≈ (D) < (B)


Explanation for the correct option:

Option B: (A) ≈ (C) ≈ (D) < (B)

  1. PdPPh32Cl2 : Here Pd is in +2 oxidation state and the configuration of Pd2+ is [Kr]4d8. As the CFSE value for Pd is very high so all the electrons will be paired and hence magnetic moment for this complex will be zero.
  2. NiCO4: Here Ni is in a 0 oxidation state and the configuration of Ni is [Ar]3d84s2. As here the ligand is carbonyl which is a strong field ligand, all the electrons will be paired and hence magnetic moment for this complex will be zero.
  3. NiCN42-: Here Ni is in a +2 oxidation state and the configuration of Ni2+=[Ar]3d8. As here the ligand is cyanide which is a strong field ligand, all the electrons will be paired and hence the magnetic moment for this complex will be zero.
  4. NiH2O62+: Here Ni is in a +2 oxidation state and the configuration of Ni2+=[Ar]3d8.. As here the ligand is water which is a weak field ligand, the electrons will not be paired and there are two unpaired electrons in this complex hence magnetic moment for this complex will be 8BM.
  5. So the order of magnetic moment is (A) ≈ (C) ≈ (D) < (B).
  6. Hence correct option.

Explanation for the incorrect options:

Option A: (C) < (D) < (B) < (A):

  1. NiCO4 Ni=[Ar]3d84s2 (strong field ligand) μ=0B.M;diamagnetic.
  2. [Ni(H2O)6]Cl2​ : NiH2O62+, Ni2+=[Ar]3d8 (weak field ligand) Number of unpaired e-=2μ=n(n+2)=2(2+2)=22B.M.
  3. Na2NiCN4 NiCN42- Ni2+=[Ar]3d8 (strong field ligand) Number of unpaired e-=0μ=0B.M
  4. PdCl2PPh32Pd2+=4d8 (diamagnetic) μ=0B.M
  5. Hence incorrect option.

Option C: (A) ≈ (C)<(B) ≈ (D)

  1. The magnetic spin of A and C can't be the same.
  2. Similarly, the magnetic spin of B and D cannot be the same.
  3. Hence incorrect option.

Option D: (C) ≈ (D) < (B) < (A)

  1. The magnetic spin of D and C can't be the same.
  2. Their magnetic field cannot be lesser than A and B.

Therefore, The correct order of the calculated spin-only magnetic moments of complexes A to D is: (A) ≈ (C) ≈ (D) < (B).


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