1.

On the basis of the electrochemical theory of aqueous corrosion, the reaction occuring at the cathode is …………. .

Answer»

`O_(2(G)) + 4H_((aq))^(+) + 4e^(-) to 2H_2O_((L))`
`Fe_((s)) to Fe_((aq))^(2+) + 2E^(-)`
`Fe_((aq))^(2+) to Fe_((aq))^(3+) + e^(-)`
`H_(2(g)) + 2OH_((aq))^(-) to 2H_2O_((l)) + 2e^(-)`

Solution :At cathode,
`2H_((aq))^(+) + 2e^(-) to 2H`
`2H^(+) + 1//2 O_2 to H_2O`
`:. 2H^+ + 1//2 O_2 + 2e^(-) to H_2O`
Balancing the above equation
`4H^+ + O_2 + 4e^(-) to 2H_2O`


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