The corrosion of iron is essentially an electrochemical phenomenon. What are the cell reactions involving in…

1. $\mathrm{Fe}$ is oxidised to ${\mathrm{F}\mathrm{e}}^{3+}$ and ${\mathrm{H}}_2\mathrm{O}$ is reduced to ${\mathrm{O}}_2^{2-}$.
2. $\mathrm{Fe}$ is oxidised to ${\mathrm{F}\mathrm{e}}^{2+}$ and ${\mathrm{H}}_2\mathrm{O}$ is reduced to ${\mathrm{O}}_2^{-}$.
3. $\mathrm{Fe}$ is oxidised to ${\mathrm{F}\mathrm{e}}^{2+}$ and ${\mathrm{H}}_2\mathrm{O}$ is reduced to ${\mathrm{O}}_2$.
4. $\mathrm{Fe}$ is oxidised to ${\mathrm{F}\mathrm{e}}^{2+}$ and dissolved oxygen in water is reduced to ${\mathrm{O}\mathrm{H}}^{-}$

Solution

Asked in: JEE-TOPICTESTS-CHEMISTRY

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