Corrosion of iron is essentially an electrochemical phenomenon where the cell reactions are
- A$Fe$ is oxidised to $Fe^{2+}$ and dissolved oxygen in water is reduced to $OH^{-}$
- B$Fe$ is oxidised to $Fe^{3+}$ and $H_2O$ is reduced to $O_2^{2-}$
- C$Fe$ is oxidised to $Fe^{2+}$ and $H_2O$ is reduced to $O_2^{-}$
- D$Fe$ is oxidised to $Fe^{2+}$ and $H_2O$ is reduced to $O_2$
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