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).
Answer:D
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).
Explanation: Since the combustion of Liquefied Petroleum Gas (LPG) produces new substances, a lot of heat is produced along with carbon dioxide and water vapour. It is also irreversible in nature. So it is a chemical change.