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

The correct option is D

Combustion of Liquefied Petroleum Gas (LPG)

Explanation for correct option:

D. Combustion of Liquefied Petroleum Gas (LPG)

Physical change:

• “A change in which a substance undergoes a change in its physical properties is called a physical change.”
• The physical changes are reversible in nature.
• Examples of physical changes are the boiling of water to give water vapour and snow as well as the melting of ice to give water.

Chemical change:

• “A change in which one or more new substances are formed is called a chemical change.”
• “A chemical change is also called a chemical reaction.”
• Examples of chemical change include rusting of iron as well as burning of magnesium ribbon.

Combustion of Liquefied Petroleum Gas (LPG) is a chemical change.

Explanation for incorrect options:

Boiling of water to give water vapour, melting of ice to give water, and dissolution of salt in water are physical changes while Combustion of Liquefied Petroleum Gas (LPG) is a chemical change. Thus, options A, B, and C are incorrect.

Hence, the correct option is D i.e. Combustion of Liquefied Petroleum Gas (LPG).