Which one of the following is a chemical change ?

Options

A. Cutting of hair
B. Graying of hair naturally
C. Swelling of resin in water
D. Cutting of fruit

Answer

B

Explanation

A chemical change (chemical reaction) is a change of materials into other new materials with different properties , and one or more new substance are formed . These processes are in general are not reversible except by further chemical reactions . Hence graying of hair is the correct answer as that cannot be reversed.