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  • Which of the following is not a physical change? (a) Boiling of water to give water vapour

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)

Answers (1)

Ans. (d)

 

(a) Boiling of water to give water vapour – Change in state – Physical change

(b) Melting of ice to give water - Change in state – Physical change

(c) Dissolution of salt in water - When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules. This is considered as a physical change.

(d) LPG is liquefied petroleum gas, which reacts with oxygen to form new products as carbon dioxide (CO_{2}) and water (H_{2}O). Therefore, combustion of LPG is a chemical change.

Combustion is always a chemical change because it is irreversible.

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