Question

Metals rust when they come in contact with oxygen of the air that forms oxides and thereby destroys the metal. Which metal forms an oxide with oxygen, that protects it from further rusting:

• A. aluminium
• B. zinc
• C. iron
• D. copper

Answer 1

Answer: (A)

aluminium

Aluminium does not rust (corrode) because its surface is protected by a natural layer of aluminium oxide $\left({Al}_2{O}_3\right)$. This prevents the metal below from coming into contact with air.