Answer: B.) \(E^0_{cell}\) > 0 = spontaneous reaction
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
Thus reaction is spontaneous when \(E^0\)= +ve
Thus reaction is non spontaneous when \(E^0\)= -ve
Thus reaction is in equilibrium when \(E^0\)= 0.
