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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 · 2023 · Mains Paper II

Q6(a). Emf of a hydrogen-electrode concentration cell

Question

Calculate the potential of the following cell: Pt(H₂, 0.1 atm) | HCl (1 M) | Pt(H₂, 1 atm).

Answer in brief

E = −0.0296 V at 298 K. The cell as written is not spontaneous; reversed, it gives +0.0296 V.

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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: electrochemical cells, Nernst equation and emf, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversconcentration cellhydrogen electrodeNernst equationelectrode concentration cellemf

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