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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 · 2022 · Paper I

Q5(b). Fractional surface coverage

Question

Obtain the expression for the fraction of surface sites adsorbed by gas molecules from the Langmuir theory of adsorption.

Answer in brief

For non-dissociative adsorption on equivalent independent sites, the fractional coverage is θ = 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 isothermfractional surface coveragemonolayer adsorptionadsorption equilibrium constant

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