Q. Which one of the following reaction is possible at anode?
A) $F_{2} + 2e^{-} \longrightarrow 2F^{-}$
B) $2H^{+} + \frac{1}{2}O_{2} + 2e^{-} \longrightarrow H_{2}O$
C) $2{Cr}^{3 +} + 7H_{2}O \longrightarrow {Cr}_{2}O_{7}^{2 -} + 14H^{+} + 6e^{-}\$
D) ${Fe}^{2 +}\ \longrightarrow {Fe}^{3 + \ \ } + e^{-}$
Explanation
(d)
Oxidation takes place at anode (c) is not feasible, $i.e.,{Cr}^{3 +}\$is not oxidised to ${Cr}_{2}O_{7}^{\ 2 - \ }$under given conditions. Hence, option (d) is correct.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.