Question

Aluminium items do not corrode easily when compared to objects made of iron because –

• A. aluminium is highly un-reactive
• B. aluminium does not react with oxygen
• C. an oxide layer offers protection from further oxidation
• D. aluminium is less reactive than hydrogen

Answer 1

The correct option is C an oxide layer offers protection from further oxidation

Unlike iron and steel, aluminium does not rust or corrode in moist conditions. Its surface is protected by a natural layer of aluminium oxide. This prevents the metal below from coming into contact with air and oxygen. The layer of aluminium oxide does not flake off, unlike rust which can flake off the surface of iron and steel objects.