हिंदी

Three complexes, [CoCl(NH3)5]2+ (I), [Co(NH3)5H2O]3+ (II) and [Co(NH3)6]3+ (III) absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:

Three complexes,

[CoCl(NH₃)₅]²⁺ (I),

[Co(NH₃)₅H₂O]³⁺ (II) and

[Co(NH₃)₆]³⁺ (III)

absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:

MCQ

(I) > (II) > (III)

Explanation:

[CoCl(NH₃)₅]²⁺ (I) has chloride (Cl⁻), a weak field ligand, resulting in the smallest splitting and absorption at the longest wavelength (lowest energy).
[Co(NH₃)₅H₂O]³⁺ (II) has ammonia and water, causing moderate splitting and absorption at a medium wavelength.
[Co(NH₃)₆]³⁺ (III) has ammonia (NH₃), a strong field ligand, leading to the largest splitting and absorption at the shortest wavelength (highest energy).