Question 1

Which of the following is not a physical change?

(a) Boiling of water to give water vapour
(b) Melting of ice to give water
(c) Dissolution of salt in water
(d) Combustion of Liquefied Petroleum Gas (LPG)

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Solution

Combustion of Liquefied Petroleum Gas (LPG) is a chemical change because it is an irreversible chemical reaction. It involves formation of new products like carbon dioxide, water vapour alongwith a lot of heat.

In rest of the cases, only physical state is changing and no new products are formed. Hence, they are physical changes.

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Similar questions

Some changes are given below.

(a) Freezing of water

(b) Melting of ice

(c) Boiling of water

Are these considered as physical changes? If yes, give the reason.

Classify the following as physical or chemical changes:

(i) Cooking of food (ii) Boiling of water

(iii) Cutting of trees (iv) Dissolving salt in water

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

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