Three complexes, C o C l N H 3 5 2 + I ,     C o N H 3 5 H 2 O 3 + ( I I ) and C o N H 3 6 3 + I I…

Three complexes,
CoClNH352+I,  CoNH35H2O3+(II) and CoNH363+III
absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:
  1. II>I>III
  2. III>II>I
  3. I>II>III
  4. III>I>(II)

Solution

On increasing strength of ligand, wavelength of absorbed radiation decreases
Strength of ligands according to spectrochemical series is: NH3>H2O>Cl-
  Order of wavelength absorbed will be Cl->H2O>NH3
  Correct order of wavelength absorbed is
I>II>III

Asked in: JEE Main 2019 (10 Apr Shift 1)

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