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Solution


Q.

The correct order of the complexes [Co(NH3)5(H2O)]3+ (A), [Co(NH3)6]3+ (B), [Co(CN)6]3- (C), and [CoCl(NH3)5]2+ (D) in terms of wavelength of light absorbed is:               [2025]
1 D > A > B > C  
2 C > B > D > A  
3 D > C > B > A  
4 C > B > A > D  

Ans.

(1)

Order of field strength of given ligands is:

Cl-<H2O<NH3<CN-. Stronger is the ligand, more is crystal field splitting and hence more is the energy absorbed. More energy absorbed means lesser wavelength absorbed.