Redox Reactions And Electrochemistry Ques 85
Question: On the basis of the electrochemical theory of aqueous corrosion, the reaction occurring at the cathode is [MP PET 1994; UPSEAT 2001]
Options:
A) $ {O_{2,(g)}}+4H_{(aq)}^{+}+4{e^{-}}\to 2H_2{O_{(l)}} $
B) $ F{e_{(s)}}\to Fe_{(aq)}^{2+}+2{e^{-}} $
C) $ Fe_{(aq)}^{2+}\to Fe_{(aq)}^{3+}+{e^{-}} $
D) $ {H_{2(g)}}+2OH_{(aq)}^{-}\to 2H_2{O_{(l)}}+2{e^{-}} $
Show Answer
Answer:
Correct Answer: A
Solution:
At cathode : $ 2{H^{+}}_{(aq)}+2{e^{-}}\to 2H $ $ 2H+\frac{1}{2}O_2\to H_2O $
$ \overline{2{H^{+}}+\frac{1}{2}O_2+2{e^{-}}\to H_2O} $
