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Question: Answered & Verified by Expert
If  Δ G = Δ H - T Δ S  and   Δ G = Δ H + T d Δ G dT , then variation of EMF of a cell E, with temperature T, is given by
ChemistryThermodynamics (C)NEET
Options:
  • A Δ H nF
  • B Δ G nF
  • C Δ S nF
  • D - Δ S nF
Solution:
1033 Upvotes Verified Answer
The correct answer is: Δ S nF
By comparision we get

Δ S = - d Δ G dT

by substituting Δ G = - nFE   and rearranging we get

dE dT = Δ S nF

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