25. An electrochemical cell operates reversibly. If its temperature coefficient is mathematically positive, what does this strictly imply about the standard entropy change () of the cell reaction?

Question

25. An electrochemical cell operates reversibly. If its temperature coefficient $(\partial E^\circ / \partial T)_P$ is mathematically positive, what does this strictly imply about the standard entropy change ($\Delta S^\circ$) of the cell reaction?

Prashant Kotian · Accepted Answer

Correct answer: B. By the Gibbs-Helmholtz relation for electrochemical cells, . Since n and F are positive constants, a positive temperature coefficient mandates a positive standard entropy change.

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