Question
Although Zn and Al are above Fe in the activity series of metals, Fe quickly rusts and corrodes but Zn and Al do not. Give reason.
Answer
Zinc and aluminium are more active metals than iron, but they don’t rust easily because they create a shield of oxide on their surface. This shield protects them from coming into contact with water and air, which can cause rusting. Iron, on the other hand, produces a less strong shield, and it can break off, leaving iron exposed and causing rusting.
