Question

Which of the following is not a physical change?

A. Boiling of water to give water vapor
B. Melting of ice to give water
C. Dissolution of salt in water
D. Combustion of liquefied petroleum gas (LPG)

Answer 1

D. Combustion of liquefied petroleum gas (LPG) is not a physical change.

Combustion is a chemical change in which a substance reacts with oxygen to produce heat, light, and new substances. In the case of LPG, it reacts with oxygen to produce carbon dioxide, water vapor, and energy.