Question bank/NEET UG/Chemistry

NEET UGChemistryModerateNEET 2025

The correct order of the wavelength of light absorbed by the following complexes is,
A. [Co(NH3)6]3+[\text{Co}(\text{NH}_3)_6]^{3+}
B. [Co(CN)6]3−[\text{Co}(\text{CN})_6]^{3-}
C. [Cu(H2O)4]2+[\text{Cu}(\text{H}_2\text{O})_4]^{2+}
D. [Ti(H2O)6]3+[\text{Ti}(\text{H}_2\text{O})_6]^{3+}
Choose the correct answer from the options given below:

Show answer and solution
Sol. λ∝1strength of ligand\lambda \propto \frac{1}{\text{strength of ligand}}

λ∝1splitting\lambda \propto \frac{1}{\text{splitting}}

A. [Co(NH3)6]3+;475 nm[\text{Co}(\text{NH}_3)_6]^{3+}\quad ; \quad 475 \text{ nm}

B. [Co(CN)6]3−;310 nm[\text{Co}(\text{CN})_6]^{3-}\quad ; \quad 310 \text{ nm}

C. [Cu(H2O)4]2+;600 nm[\text{Cu}(\text{H}_2\text{O})_4]^{2+}\quad ; \quad 600 \text{ nm}

D. [Ti(H2O)6]3+;498 nm[\text{Ti}(\text{H}_2\text{O})_6]^{3+}\quad ; \quad 498 \text{ nm}

Order of λ=C > D > A > B\lambda = \text{C > D > A > B}

Source: geekyrakshit/indian-exam-questions / neet2025-code45

More NEET UG questionsChapter practice

Need a video for this idea?

Scan any doubt from your notes and get a whiteboard explanation.

Scan a doubtView plans