Give a reason to explain:
$(i)$ Why do aluminium sheets not corrode easily?
$(ii)$ Why is a copper vessel covered with a green coating in the rainy season?

(N/A) $(i)$ Aluminium does not corrode easily because,upon exposure to air,its surface forms a thin,protective,and non-reactive layer of aluminium oxide $(Al_2O_3)$. This layer prevents further oxidation of the metal.
$(ii)$ Copper vessels develop a green coating in the rainy season because copper reacts with moist carbon dioxide $(CO_2)$ and water vapor in the air to form a mixture of copper carbonate $(CuCO_3)$ and copper hydroxide $(Cu(OH)_2)$,which is green in color.