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Question

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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