Which of the following is a physical change?

Explanation:

Physical change: The change in shape and size of a substance is known as physical change.

Chemical change: in chemical change the molecular formula of a substance changes.

New substances are formed.

Burning of coal:  C + O₂ → CO₂

Hence it is chemical change

Photosynthesis : 6CO₂ + 6H₂O → C₆H₁₂O₆

Hence it is chemical change

Dissolving sugar in water : C₆H₁₂O₆(s) + H₂O → C₆H₁₂O₆(aq)

Hence it is physical change

Digestion of food : C₆H₁₂O₆ + 6O₂ →  6CO₂ + 6H₂O

Hence it is chemical change

Final Answer: Hence,the correct answer is (C) dissolving sugar in water.