Arrange the following complex ions in increasing order of crystal field splitting energy Δ0.

[Cr(Cl)6]3–, [Cr(CN)6]3–, [Cr(NH3)6]3+



Crystal field splitting energy Δ0 increases in the order:

[Cr(Cl)6]3– < [Cr(NH3)6]3+ < [Cr(CN)6]3–


Among the ligands Cl, NH3 and CN, Cl is the weakest ligand and CN is the strongest one. Therefore, increasing order of crystal field splitting energy Δ0 is: [Cr(Cl)6]3– < [Cr(NH3)6]3+ < [Cr(CN)6]3–


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