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Cell reaction is spontaneous when :
A
$\Delta G^\circ$ is negative
B
$\Delta G^\circ$ is positive
C
$\Delta E^\circ_{Red}$ is positive
D
$\Delta E^\circ_{Red}$ is negative
Detailed Solution
$\Delta G^\circ = -nFE^\circ_{cell}$
A reaction is spontaneous when $\Delta G$ is negative, which corresponds to a positive $E_{cell}$.
So a cell reaction is spontaneous when $\Delta G^\circ$ is negative.
A reaction is spontaneous when $\Delta G$ is negative, which corresponds to a positive $E_{cell}$.
So a cell reaction is spontaneous when $\Delta G^\circ$ is negative.