In which of the following octahedral complexes of Co (at. no. 27), will the magnitude of $\Delta _o$ be the highest?

Question

[Co(CN)₆]³⁻

[Co(C₂O₄)₃]³⁻

[Co(H₂O)₆]³⁺

[Co(NH₃)₆]³⁺

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