Answer:
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.
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