• # question_answer Articles of iron are generally coated with zinc. Explain.

Iron gets easily rusted in the presence of moist air. Formation of rust $(F{{e}_{2}}{{O}_{3}}.x\,{{H}_{2}}O)$ is a redox reaction in which Fe is oxidised to  $F{{e}^{3+}}$ ions. Since zinc is more reactive than iron (placed below iron in the activity series), it is oxidised to$Z{{n}^{2+}}$ ions instead of iron when coated over the surface of iron. Thus, zinc takes part in the redox reaction while surface of iron remains intact.