Question

What is the difference between iron and aluminium with respect to corrosion?

• A. Aluminium does not corrode
• B. Corroded iron is soluble in water
• C. Aluminium corrodes but iron does not corrode
• D. Aluminium is less reactive than iron and so corrodes less

Answer 1

Answer: (A), (B)

The correct options are
A Aluminium does not corrode
B Corroded iron is soluble in water

Aluminium is more reactive than iron but it forms a layer of aluminium oxide that prevents further corrosion. Even iron forms an iron oxide layer but it is not able to stop further corrosion. So, Aluminium is widely used in all industries. The corroded iron dissolves in water.

Hence the options A and B are correct.