Skip to content
ChemistryNEET 2025Valence bond and crystal field theory

Coordination Compounds

The correct order of the wavelength of light absorbed by the following complexes is:

A. [Co(NH3)6]3+\mathrm{[Co(NH_3)_6]^{3+}} · B. [Co(CN)6]3−\mathrm{[Co(CN)_6]^{3-}} · C. [Cu(H2O)4]2+\mathrm{[Cu(H_2O)_4]^{2+}} · D. [Ti(H2O)6]3+\mathrm{[Ti(H_2O)_6]^{3+}}

Choose the correct answer from the options given below:

  1. A.B < D < A < C
  2. B.B < A < D < C✓
  3. C.C < D < A < B
  4. D.C < A < D < B

Solution

Wavelength absorbed is inversely related to Δ0\Delta_0. CN−\mathrm{CN^-} (strongest field) gives the largest splitting, then NH3\mathrm{NH_3}; Ti3+\mathrm{Ti^{3+}} with water splits less, and Cu2+\mathrm{Cu^{2+}} with water least (absorbs in the red, ~800 nm). So B < A < D < C.

Save for spaced revision (free account)

More from this chapter in past papers

From Chemistry › Coordination Compounds › Valence bond and crystal field theory — lectures, notes and every past question on it.

Last revised . Found a mistake? Tell us — corrections are the fastest thing we act on.

ShareWhatsAppTelegram