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Question
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:
Options
(III) > (I) > (II)
(III) > (II) > (I)
(I) > (II) > (III)
(II) > (I) > (III)
MCQ
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Solution
(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).
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