Arrange the following complex ions the increasing order of crystal field splitting energy ` (delta _0) [CrCl_6]^(3-) , [Cr(CN)_6]^(3-) ,[Cr(NH_3) _6]^(3+) `

Explanation

(i) CFSE is higher when the complex contains strong field ligand as per spectro chemical series.
Thus crystal field splitting energy increases in the order
`[CrCl_6]^(3-) -lt [Cr(NH_3) _6]^(3+) lt [Cr(CN)_6]^(3-) ` Because the order of field strength is ` Cl^(-) lt NH^(3) lt CN^(-) `