Corrosion is an elctrochenmical process . It involves

Options

A. Loss of electrons by Iron, `Fe rarr Fe^(+2) + 2e^(-)` . Ie, Iron acts as an anode
B. Inpurities act as a cathode. Elements are used in forming hydroxyl ions `H_2O + O+2e^(-) rarr 2OH^(-)`
C. Ferrous ions are osidised to ferric ions in presence of dissolved oxygen
`2Fe^(+2) + O + H_2O rarr 2Fe^(+3) + 2HO^-`
D. All the above reactions

Answer

D

Explanation

Corrosion is electrochemical oxidation of iron