Question

In some case oxidation is considered as desirable. Justify by giving suitable example. Choose from the options below *

2 points

It prevents further corrosion of fresh metal inside, like in aluminium utensils

So that it need not to be painted on aperiodic basis, like statue of liberty it has greenish colour

The metal shine dsappears and appears to be a different metal which is suitable for smuggling

because it makes the metal strong enough and can last longer period of time​

Answer 1

(a)It prevents further corrosion of fresh metal inside, like in aluminium utensils.

Explanation:

1. Aluminium metal has good corrosion resistance.
2. In the presence of oxygen, aluminium develops a thin oxide layer on the surface of the metal.
3. The oxide layer formed on the surface protects the rest of the aluminium metal from corrosion.
4. Even if the oxide layer is damaged another oxide layer is immediately regenerated to protect the metal.
5. The oxide layer can solely protect the metal even in harsh environments with temperature fluctuation.