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

Correct Answer: (c) corrosion and it is a chemical change

Explanation: Rusting of iron is called corrosion and it leads to the formation of a new compound. Hence, it is a chemical change. The action of air and moisture on iron converts it to its oxide. This process is known as Rusting.