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In which of the following coordination entities the magnitude Δ₀ (CFSE in octahedral field) will be maximum?

1. [Co(H₂O)₆]³⁺
2. [Co(NH₃)₆]³⁺
3. [Co(CN)₆]³⁻
4. [Co(C₂O₄)₃]³⁻

Correct answer: [Co(CN)₆]³⁻

Solution

The magnitude of Δ₀ depends on the ligand's field strength. Among the given ligands, CN⁻ is the strongest field ligand (as per the spectrochemical series), leading to the highest CFSE in [Co(CN)₆]³⁻.

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