CTET PAPER II 2019 · PYQ · Physical and Chemical Changes · easy
Which of the following statements is NOT correct?
A.Digestion is a chemical change.
B.Photosynthesis is a chemical change.
C.Respiration is a chemical change.
D.Crystallisation is a chemical change.✓ Correct
Explanation
Crystallisation is a physical change — substances rearrange into crystal form without altering their chemical composition. Digestion (breakdown of food into simpler substances), photosynthesis (synthesis of glucose from CO₂ and water), and respiration (oxidation of glucose) all involve chemical transformations and are chemical changes. Hence crystallisation being called a chemical change is incorrect.
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