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QJEEM20Ch9597: JEE Main 2020 Chemistry - Class 12 JEEM20Ch9597 Solution: Simplified absorption spectra of three complexes ((i), (ii) and …

Simplified absorption spectra of three complexes ((i), (ii) and (iii)) of Mn+ ion are provided below; their λmax values are marked as A, B and C respectively. The correct match between the complexes and their λmax values is JEE Main 2020 (Online) 2nd September Evening Slot Chemistry - Coordination Compounds Question 200 English
(i) [M(NCS)6](–6 + n)
(ii) [MF6](–6 + n)
(iii) [M(NH3)6]n+

Multiple Choice Options

  • A A-(i), B-(ii), C-(iii)
  • B A-(ii), B-(iii), C-(i)
  • C A-(ii), B-(i), C-(iii)
  • D A-(iii), B-(i), C-(ii)

Step-by-Step Verified Solution

Stronger the ligand greater is splitting of d orbitals and smaller will be wavelength of light absorbed.

The splitting of ligand is F– < NCS– < NH3

So order of wavelength of light absorbed is

(λmax)NH3 < (λmax)NCS– < (λmax)F–

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