Question

Q3. For spontaneity of cell, which is correct?
(a) AG = 0, E° = 0 (b)AG = -Ve, E° = 0
(b) (c) AG = +Ve, E° = 0
(d) AG = -Ve, E = +v​

Answer 1

For spontaneity of cell, the correct relation is $\Delta G$ = -ve and  $E^0=+ve$

Explanation:

The standard emf of a cell is related to Gibbs free energy by following relation:

$\Delta G=-nFE^0$

$\Delta G$ = gibbs free energy

n= no of electrons gained or lost  

F= faraday's constant

$E^0$ = standard emf  

when $\Delta G$ = +ve, reaction is non spontaneous

$\Delta G$ = -ve, reaction is spontaneous

$\Delta G$= 0, reaction is in equilibrium

$-ve=-nFE^0$

$E^0=+ve$

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