Q. The standard reduction potential for the half-cell having reaction ${NO}_{3}^{-}(aq) + 2H^{+}(aq) + e^{-} \rightarrow {NO}_{2}(g) + H_{2}O$ Is 0.78 V. What will be the reduction potential of the half-cell is a neutral solution?
A) 0.78 V
B) 0.89 V
C) 0.36 V
D) 0.59 V
Explanation
(c)
$E_{red} = 0.78 + \frac{0.0591}{1}\log\left( 10^{- 7} \right)^{2}$
$\ = 0.78 - 0.059 \times 7 = 0.367\ V$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.