Homogeneous and Heterogeneous Catalysis — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Homogeneous and Heterogeneous Catalysis.

Identification of Catalysis Type from Reaction Examples

high

This is a fundamental and frequently tested aspect. NEET aspirants must be able to quickly and accurately classify a given chemical reaction as either homogeneous or heterogeneous catalysis by identifying the phases of the reactants and the catalyst. Questions will likely present a reaction equation or a description of a process and ask for the correct classification. Examples like the Haber process, Ostwald process, hydrogenation, acid-base catalysis, and the Wacker process are prime candidates for such questions. A strong recall of these examples and their phase relationships is crucial.

Mechanism-based Conceptual Questions

medium

Questions delving into the 'how' of catalysis, specifically the intermediate compound formation theory for homogeneous catalysis and the adsorption theory for heterogeneous catalysis, are likely. These might involve identifying the correct sequence of steps in a mechanism, or identifying a statement that is *not* part of a particular mechanism. Understanding the role of active sites, adsorption, and desorption in heterogeneous catalysis, and intermediate formation in homogeneous catalysis, will be key. Distractors might mix elements of both mechanisms.

Properties and Effects of Promoters and Poisons

medium

The concepts of catalyst promoters and poisons are important practical aspects of catalysis, particularly in industrial settings. Questions could describe a scenario where a substance is added to a catalytic reaction and ask for its role (promoter or poison) or explain its effect on the catalyst's activity. The Haber process, with molybdenum as a promoter and CO as a potential poison, is a classic example often used in such questions. Understanding the definition and impact of these substances is essential.