Question 2

Which of the following is a chemical change?
(a) Twinkling of stars
(b) Cooking of vegetables
(c) Cutting of fruits
(d) Boiling of water

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Solution

Cooking of vegetables is the only chemical change. Vegetables are cooked to make food. Other options are all physical changes.

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Classify the following as physical or chemical changes:

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(v) Digestion of food (vi) Melting of ice

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