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–