Q. If the $\mathrm{\Delta}G$ of a cell reaction $AgCl + e^{-} \rightarrow Ag + {Cl}^{-}$ is $- 21.20$ kJ, the standard emf of cell is
A) 0.239 V
B) 0.220 V
C) $- 0.320$ V
D) $- 0.110\$V
Explanation
(b)
$\mathrm{\Delta}G^{{^\circ}} = - n{FE}^{{^\circ}}$
$- 21.2 = - 1 \times 96500 \times E$
$E = \frac{21.2}{96500} = 0.220\ V$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.