Answer: Option (b) is the correct answer.
Explanation:
A change that does not lead to any difference in chemical composition of a substance is known as a physical change.
For example, shape, size, mass, volume, density, boiling point, etc of a substance are all physical properties.
On the other hand, changes that lead to bring change in chemical composition of a substance is known as a chemical change.
For example, exploding dynamite, rotting cheese etc are all chemical changes.
A chemical change will always lead to the formation of a new product.
Whereas if state of a substance is changing from solid to liquid or liquid to gas etc then it is known as a phase change.
Thus, we can conclude that the combining of one substance with another which yields a different product is the result of a chemical change.
