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NCERT · Class 9 · Science

Chapter 2: Is Matter Around Us Pure?

Practice each question, then open the answer or worked solution.

Exercise

Textbook page 28 · 11 questions
Q11Multiple choice

Which of the following are chemical changes?

(e) Digestion of food 

(f) Freezing of water

(g) Burning of candle

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Worked solution

Out of the given list, the following are chemical changes:

Growth of a plant, rusting of iron, cooking of food, digestion of food and burning of candles.