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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 · 2016 · Mains Paper II

Q6. Dissociative Langmuir adsorption

Question

For dissociative chemisorption A₂(g) ⇌ 2A(ads) at pressure P, derive an equation for fractional surface coverage θ using Langmuir theory.

Answer in brief

θ=(√(KP))/(1+√(KP)), where K=kₐ/kd.

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CoversDissociative Langmuir adsorptionSurface chemistry