On the basis of electrochemical theory of aqueous corrosion, the reaction occurring at the cathode is

Options

A. `O_(2(g))+4H_((aq))^(+)+4e^(-)rarr2H_2O_((l)`
B. `Fe_((s))rarrFe_((aq))^(2+)+2e^(-)`
C. `Fe_((aq))^(2+)rarrFe_((aq))^(3+)+e^(-)`
D. `H_(2(g))+2OH_((aq))^(-)rarr2H_2O_((l))+2e^(-)`

Answer

A

Explanation

At cathode : `2H_((aq))^(+) +2e^(-) rarr 2H`
`(2H+1/2O_2rarrH_2O)/(2H^(+)+1/2O_2+2e^(-)rarrH_2O)`