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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

Q5(b). Langmuir adsorption isotherm

Question

State the assumptions of Langmuir adsorption and derive its isotherm.

Answer in brief

For monolayer adsorption on equivalent independent sites, θ = KP/(1 + KP) and v = vm KP/(1 + KP).

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Topic notes: adsorption isotherms, heterogeneous catalysis and colloids, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversLangmuir adsorption isothermmonolayer adsorptionassumptions of Langmuir isothermfractional coverage θ

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