Question

In which of the following complexes of the Co (at. no. 27), will the magnitude of $\Delta_o$ be the hightest?
(a) [Co(CN)₆]³⁻
(b) [Co(C₂O₄)₃]³⁻
(c) [Co(H₂O)₆]³⁺
(d) [Co(NH₃)₆]³⁺

Answer 1

[Co(CN)6]3–

Explanation:

CFSE (crystal field spitting energy) for octahedra, complex, Δo depends on on the strength of negative ligand. Spectrochemically, it has been found that the strength of splitting as follows

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