Rusting of an article made up of iron is called-

a) corrosion and it is a physical as well as chemical change
b) dissolution and it is a physical change
c) corrosion and it is a chemical change
d) dissolution and it is a chemical change

Ans – [C] 

Explanation – Rusting of an iron is a corrosion and it is a chemical change. It is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.