MP Board · Class 9 · Science · Is Matter Around Us PureClassify the following as physical or chemical changes: (i) Rusting of iron, (ii) Melting of ice, (iii) Burning of paper, and (iv) Dissolving salt in water. Give a brief reason for your answer.

Physical changes: (ii) Melting of ice and (iv) Dissolving salt in water. These are physical changes because no new chemical substances are formed; only the state or physical appearance changes, and they can be reversed easily. Chemical changes: (i) Rusting of iron and (iii) Burning of paper. These are chemical changes because new substances with completely different chemical properties (iron oxide, carbon dioxide, ash, etc.) are formed during these non-reversible reactions.