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JEE MainChemistryCoordination Compounds

Given below are five coordination complexes: (A) [ Mn ( CN )₆]³⁻ (B) [ Cr ( H ₂ O )₆]²⁺ (C) [ Fe ( H ₂ O )₆]²⁺ (D) [ Cr ( CN )₆]⁴⁻ (E) [ CoF ₆]³⁻ Identify the complexes in which the central metal ion has a t_ 2g ^4 e_g^0 electronic configuration.

Options

  1. A(A), (B) and (D) only
  2. B(C) and (E) only
  3. C(A) and (C) only
  4. D(A) and (D) only

Correct answer

D. (A) and (D) only

Step-by-step solution

The electronic configuration of the central metal ion in each complex is determined by its oxidation state and the nature of the ligand (strong or weak field). (A) [ Mn ( CN )₆]³⁻ : Mn is in +3 oxidation state. Mn ³⁺ has a 3d^4 configuration. Since CN ^- is a strong field ligand, pairing occurs, resulting in t_ 2g ^4 e_g^0 . (B) [ Cr ( H ₂ O )₆]²⁺ : Cr is in +2 oxidation state. Cr ²⁺ has a 3d^4 configuration. H ₂ O is a weak field ligand, so it forms a high spin complex with configuration t_ 2g ^3 e_g^1 . (C) [ Fe

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