Question

2. Which of the following is a chemical change
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Answer 1

Growth of a plant, rusting of iron, cooking of food, digestion of food, and burning of candle are chemical changes because here the chemical composition of the substance changes.

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Answer 2

Explanation:

Rotting, burning, cooking, and rusting are all further types of chemical changes because they produce substances that are entirely new chemical compounds. For example, burned wood becomes ash, carbon dioxide, and water. When exposed to water, iron becomes a mixture of several hydrated iron oxides and hydroxides.