Q. If the $H^{+}$ concentration is decreased from 1 M to $10^{- 4}$ M at 25 ℃ for the couple ${MnO}_{4}^{-}/\ {Mn}^{2 +}$, then the oxidising power of the ${MnO}_{4}^{-}/\ {Mn}^{2 +}$ couple decreases by
A) -0.18 V
B) 0.18 V
C) 0.38 V
D) -0.38 V
Explanation
(c)
The oxidizing power of ${MnO}_{4}^{-}\ /{Mn}^{2 +}$ couple decreases by 0.38 V.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.