Question:

Considering the strength of the ligand, the highest excitation energy will be observed in:

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Stronger ligand → higher splitting energy.

  • [Co(Hâ‚‚O)₆]³⁺

  • [Co(NH₃)₆]³⁺

  • [Co(CN)₆]³⁻

  • [CoCl₆]³⁻

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The Correct Option is C

Solution and Explanation

CN⁻ is a strong field ligand → large splitting → high excitation energy.

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