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Chemistry · PYQ NEET UG 2025
हिन्दीThe correct order of the wavelength of light absorbed by the following complexes is, A. \( [\mathrm{Co}(\mathrm{NH}_3)_6]^{3+} \) B. \( [\mathrm{Co}(\mathrm{CN})_6]^{3-} \) C. \( [\mathrm{Cu}(\mathrm{H}_2\mathrm{O})_4]^{2+} \) D. \( [\mathrm{Ti}(\mathrm{H}_2\mathrm{O})_6]^{3+} \) Choose the correct answer from the options given below:
Correct answer · Option 1
B < D < A < C
Explanation
Wavelength \( \lambda \) is inversely proportional to crystal field splitting energy \( \Delta_0 \). Stronger field ligand \( (\mathrm{CN}^- > \mathrm{NH}_3 > \mathrm{H}_2\mathrm{O}) \) gives larger \( \Delta_0 \) and hence shorter wavelength.
