JEE MAIN - Chemistry (2019 - 10th April Morning Slot - No. 6)
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 :
[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 :
(III) > (I) > (II)
(III) > (II) > (I)
(I) > (II) > (III)
(II) > (I) > (III)
Explanation
As in a co-ordination compound, the strong field
ligand causes higher splitting of the d-orbitals
Also we know,
strength of ligand $$ \propto $$ $${1 \over {{\lambda _{absorbed}}}}$$
Order of strength of ligand
NH3 > H2O > Cl-
Therefore decreasing order of wavelength absorbed is (I) > (II) > (III)
Also we know,
strength of ligand $$ \propto $$ $${1 \over {{\lambda _{absorbed}}}}$$
Order of strength of ligand
NH3 > H2O > Cl-
Therefore decreasing order of wavelength absorbed is (I) > (II) > (III)
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