1.

Correct increasing order for the wavelength of absorption in the visible region for the complexes of Co 3+ is:(1)  [Co(CN)6]3- , [Co(NH3)6]3+ , [Co(NH3)5(H2O)] 3+ [Co(NH3)5Cl]+2(2)  [Co(CN)6]3- , [Co(NH3)5(H2O)]3+ [Co(NH3)5Cl]+2 [Co(NH3)6]3+ ,(3)  [Co(NH3)6]3+ , [Co(CN)6]3-, [Co(NH3)5(H2O)]3+ [Co(NH3)5Cl]+2 (4)  [Co(NH3)5Cl]+2 , [Co(NH3)5(H2O)]3+ , [Co(NH3)6]3+ , [Co(CN)6]3-

Answer»

Correct option (1)  [Co(CN)6]3- , [Co(NH3)6]3+ , [Co(NH3)5(H2O)]3+ [Co(NH3)5Cl]+2

Explanation:

Strength of ligands attached with Co3+ ion is in the order of CN-  > NH3 > H2O > Cl-. So order of spliting (value of Δ0 ) will be in the same order.

∴  Wave length absorbing light α1/Δ0



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