Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

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

  1. A

    (I) > (II) > (III)

  2. B

    (II) > (I) > (III)

  3. C

    (III) > (I) > (II)

  4. D

    (III) > (II) > (I)

Solution

In a co-ordination compound, the strong field ligand causes higher splitting of the d-orbitals. Wavelength of the energy absorbed by the coordination compound is inversely proportional to ligand field strength of the given coordination compound. The decreasing order of ligand field strength is NH3 > H2O > Cl. Therefore decreasing order of wavelength absorbed is (I) > (II) > (III).

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