Redox Reactions And Electrochemistry Ques 228

Question: For the feasibility of a redox reaction in a cell, the e.m.f. should be [J & K 2002]

Options:

A) Positive

B) Fixed

C) Zero

D) Negative

Show Answer

Answer:

Correct Answer: A

Solution:

Any redox reaction would occur spontaneously if the free energy change $ (\Delta G) $ is negative. $ \Delta G^{o}=nFE^{o} $ Where $ n $ is the number of electrons involved, $ F $ is the value of Faraday and $ E^{o} $ is the cell emf. $ \Delta G^{o} $ can be negative if $ E^{o} $ is positive.



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