NEETChemistryCoordination Compounds
A metal ion M (Z = 26) in +3 oxidation state forms two octahedral complexes, P and Q, with ligands L₁ and L₂ respectively. The spin-only magnetic moment of complex P is 1.73 BM and that of complex Q is 5.92 BM. Which of the following statements is correct?
Options
- AL₁ is a weak field ligand and complex P has sp^3d^2 hybridisation
- BL₂ is a strong field ligand and complex Q has d^2sp^3 hybridisation
- CL₂ is a weak field ligand and complex Q has d^2sp^3 hybridisation
- DL₁ is a strong field ligand and complex P has d^2sp^3 hybridisation
Correct answer
D. L₁ is a strong field ligand and complex P has d^2sp^3 hybridisation
Step-by-step solution
The metal M with atomic number 26 is Iron (Fe). In the +3 oxidation state, Fe ³⁺ has the electronic configuration [ Ar ] 3d^5 . For complex P, the spin-only magnetic moment is = 1.73 BM. Using the formula = n(n+2) , we get n = 1 unpaired electron. A 3d^5 configuration with 1 unpaired electron implies that the electrons are paired up ( t_ 2g ^5 e_g^0 ). This pairing occurs in the presence of a strong field ligand. Therefore, L₁ is a strong field ligand and complex P undergoes d^2sp^3 hybridisation (inner orbital com