Q32Short answer
Arrange following complex ions in increasing order of crystal field splitting energy (∆O) : [Cr(Cl)6]3–, [Cr(CN)6]3–, [Cr(NH3)6]3+.
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Crystal field splitting energy increases in the order [Cr(Cl)6] < [Cr(NH3)6] 3– < [Cr(CN)6]