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Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper I covers physical and inorganic chemistry.

Indian Forest Service (Mains), Chemistry optional · 2025 · Paper I

Q6(b)(ii). Heterogeneous catalysis

Question

Explain heterogeneous catalysis with a suitable example.

Answer in brief

Reactants and catalyst occupy different phases; adsorption and surface reaction provide a faster pathway with lower activation barriers.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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Topic notes: Arrhenius equation, collision theory and transition-state theory, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversheterogeneous catalysisHaber processiron catalystdissociative adsorptioncatalyst poisoning

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