JEE Main 2019 — Coordination Compounds Question with Solution
From: JEE Main 2019 (Online) 10th April Morning Slot
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 :
[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 :
Choose an option
Show full solutionCorrect option: C
Correct answer
C(I) > (II) > (III)
Step-by-step explanation
As in a co-ordination compound, the strong field
ligand causes higher splitting of the d-orbitals
Also we know,
strength of ligand
Order of strength of ligand
NH3 > H2O > Cl-
Therefore decreasing order of wavelength absorbed is (I) > (II) > (III)
Also we know,
strength of ligand
Order of strength of ligand
NH3 > H2O > Cl-
Therefore decreasing order of wavelength absorbed is (I) > (II) > (III)
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This is a previous-year question from JEE Main 2019, covering the Coordination Compounds chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.