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

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

J & K CETJ & K CET 2005

Solution:

For spontaneous reaction $\Delta G$ should be negative
$\Delta G^{\circ}=n F E^{\circ}$
where, $\Delta G^{\circ}=$ Free energy charge
$E^{\circ}=$ emf of the cell
The value of $\Delta G^{\circ}$ will be negative,
if the value of $E^{\circ}$ is positive.