Which of the following comparisons is correct for ₀ of the following complexes? I- [ Co(H ₂ O) ₆]²⁺ II- [ Co(H ₂ O) ₆]³⁺ III- [ Fe(H ₂ O) ₆]³⁺ IV- [ Fe(CN) ₆]³⁺

Step-by-step solution

The crystal field splitting energy ( ₀ ) depends on several factors, including the oxidation state of the central metal ion and the nature of the ligands. 1. Oxidation state of the metal ion: For the same metal and ligand, ₀ increases with an increase in the oxidation state of the central metal ion. This is because a higher charge on the metal ion draws the ligands closer, leading to greater repulsion and a larger splitting of the d-orbitals. In complex I, Co is in the +2 oxidation state: [ Co(H ₂ O) ₆]²⁺ . In comp