IGNOU MCH 22 2025 2026 - Explain the nature of absorption spectra for the transition and inner

Question

Explain the nature of absorption spectra for the transition and inner transition elements by UV-Vis spectroscopy. Also specify the reasons of difference between the two.

01 Mar 2026

Answer :

Word Count : 262

UV-Vis spectroscopy is widely used to study the electronic absorption spectra of transition and inner transition elements because it involves electronic transitions between energy levels. In transition elements (d-block elements), the absorption of UV-Visible radiation generally arises from d–d transitions. These transitions occur when electrons are excited from a lower-energy d-orbital to a higher-energy d-orbital within the same atom or ion. The presence of partially filled d-orbitals and the effect of ligand field splitting in complexes give rise to characteristic absorption bands. These bands are often

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