Q. The cell reaction is spontaneous, when
A) $E_{red}^{{^\circ}}$ is negative
B) $E_{red}^{{^\circ}}$ is positive
C) ${\Delta G}^{{^\circ}}$ is negative
D) ${\Delta G}^{{^\circ}}$ is positive
Explanation
(c)
$\bigtriangleup G\ = \ \bigtriangleup H\ - \ T \bigtriangleup S$
For a spontaneous cell reaction, $\bigtriangleup H\$should be negative and $\bigtriangleup S$ should be positive. Hence, $\bigtriangleup G$ should be negative.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.