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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2019 · Mains Paper I

Q2(b). Equilibrium constant from cell potential

Question

Calculate the equilibrium constant of the following reaction at 298 K. Zn(s) + Cu²⁺ ⇌ Zn²⁺ + Cu(s). Given: Cu²⁺ + 2e⁻ ⇌ Cu, E°=0.337 V; Zn²⁺ + 2e⁻ ⇌ Zn, E°=-0.763 V. Comment on the feasibility of the above redox reaction.

Answer in brief

E°=1.100 V and K≈1.5×10³⁷ at 298 K; the forward reaction is strongly favourable under standard conditions.

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CoversEquilibrium constant from cell potentialElectrochemical thermodynamics

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