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ChemistryJEE Main 24 Jan 2026, Shift 2·Q7·MCQ·Easy–moderate

Coordination Compounds · Spectrochemical series absorbed wavelength

The wavelengths of light absorbed for the following complexes are in the order. [Co(NHX3)X6]X3+(I) ; [Co(HX2O)X6]X3+(II) ; [Co(CN)X6]X3−(III) ; [Co(NHX3)X5(HX2O)]X3+(IV) ; [CoFX6]X3−(V) \underset{\text{(I)}}{\ce{[Co(NH3)6]^3+}}\ ;\ \underset{\text{(II)}}{\ce{[Co(H2O)6]^3+}}\ ;\ \underset{\text{(III)}}{\ce{[Co(CN)6]^3-}}\ ;\ \underset{\text{(IV)}}{\ce{[Co(NH3)5(H2O)]^3+}}\ ;\ \underset{\text{(V)}}{\ce{[CoF6]^3-}}
  1. (1)III << I << II << IV << V
  2. (2)III << I << IV << V << II
  3. (3)III << IV << I << II << V
  4. (4)III << I << IV << II << V
We corrected a printing error in the original paper

Source printed “The wavelength of light absorbed for the following complexes are”.

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See the full 24 Jan 2026, Shift 2 paper