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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 · 2019 · Mains Paper II

Q8(b). Iron–silver cell

Question

Write the reaction and calculate the emf at 25° C of Fe|Fe²⁺ (0.01 M) || Ag⁺ (0.1 M)|Ag. Given E°_(Ag+/Ag)=0.80 V and E°_(Fe²⁺/Fe)=-0.44 V.

Answer in brief

Fe + 2Ag⁺ → Fe²⁺ + 2Ag; E=1.24 V in the concentration approximation.

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CoversIron–silver cellElectrochemistry

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