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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper II covers physical chemistry.

UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper II

Q8(b). Langmuir constant from adsorption data

Question

Write the Langmuir isotherm in terms of fractional coverage θ and equilibrium gas pressure p at fixed temperature. How can its constant be determined?

Answer in brief

θ=Kp/(1+Kp); a plot of p/θ against p has intercept 1/K and slope 1.

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CoversLangmuir constant from adsorption dataSurface chemistry

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