(2)

Corrosion slowly coats the surfaces of metallic objects with oxides or other salts of the metal. The rusting of iron, tarnishing of silver, development of green coating on copper and bronze ornaments are some of the examples of corrosion.

(4)

Reduction potential values of $E_{{\text{Zn}}^{2+}/\text{Zn}}^{\circ }=-0.76$ $\text{V}$ and $E_{{\text{Fe}}^{2+}/\text{Fe}}^{\circ }=-0.44$ $\text{V}$

Thus, due to higher negative electrode potential value of zinc than iron, iron cannot be coated on zinc.