* Note:

Chemical change is a change where a substance is changed and a new substance is formed.

Physical change: A physical properties change in which a substance undergoes a change in its physical properties is called a physical change. change. In such a change, no new substance is formed.

(a), (c), (f) → Chemical Changes.

(a) Photosynthesis is a chemical process by which green plants convert light energy (Sunlight) into chemical energy (Carbohydrates).

(c) Burning of coal is a chemical change because new substances carbon dioxide and water are formed.

(f) Digestion of food is a chemical change as food is broken down into its constituent’s chemicals by the help of enzymes.

(b), (d), (e) → Physical Changes.

(b) Dissolving sugar in water is a physical change because when sugar molecules are mixed in water, they dissolved in water molecules and no new substance is formed.

(d) Melting of wax is also physical change because there is no new substance is formed on melting of wax.

(e) Beating aluminum to make aluminum foil is a physical change because no new substance is formed and only the physical properties like shape, size, etc. change.