Which of the following is not a chemical change?

Freezing of water

The correct answer is option 4. Freezing of water.

During a chemical one substance reacts with another to undergo a change in chemical composition.

Chemical change brings change in the chemical properties of matter, and we get new substances.

A chemical change is also called a chemical reaction.

Example: Rusting of iron, Cooking of food, Growth of a plant, Digestion of food etc.

But freezing of water is a physical change in which physical state of water changes from liquid to solid.