Which of the following represents the correct order for the wavelength of absorption in the visible region for the following? [Co(NO2)6]4- (I) [FeF6]4- (II) [Fe(H2O)6]3+ (III) [Co(NH3)6]2+ (IV)

Question

Which of the following represents the correct order for the wavelength of absorption in the visible region for the following?
[Co(NO2)6]4- (I)   [FeF6]4- (II)   [Fe(H2O)6]3+ (III)   [Co(NH3)6]2+ (IV)

Prashant Kotian · Accepted Answer

Correct answer: C. The order of ligand strength in the spectrochemical series F–  H2O  NH3  NO2 –. And CFSE for octahedral complex is Fe+2 < Co+2 due to high ENC . A strong ligand causes a larger degree of splitting resulting in high value of E (energy). Therefore, corresponding low value of  hc E        

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