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Q.

For the feasibility of a redox reaction in a cell, the emf should be 

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a

Fixed

b

Positive

c

Zero

d

Negative

answer is B.

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Detailed Solution

Any redox reaction would occur spontaneously if the free energy change (ΔG) is negative. 

ΔGo=nFEo

Where n is the number of electrons involved, F is the value of Faraday and Eo is  the cell emf. ΔGo can be negative if Eo is positive. 

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