CTET PAPER II 2021 · PYQ · Physical and Chemical Changes · easy
Which of the following sets comprises chemical changes?
A.Boiling of water, breaking of glass, rusting of iron
B.Dissolving salt in water, digestion of food, shredding of paper.
C.Cooking of food, boiling of water, dissolving sugar in water.
D.Rusting of iron, burning of paper, digestion of food✓ Correct
Explanation
A chemical change produces a new substance with different chemical properties and is usually irreversible. Rusting of iron forms iron oxide, burning of paper produces ash and gases, and digestion of food chemically breaks down food into different substances — all are chemical changes. Other options include physical changes such as boiling of water, breaking of glass, dissolving salt or sugar in water, and shredding of paper, which do not produce new substances.
💡 Practice unlimited CTET PAPER II PYQs + AI-tracked progress on each topic. Sign up free →