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

Chemical Change vs Physical Change-01.jpg

A physical change is the one in which the chemical properties of a substance do not change

 

Let’s check all the options

  • In the case of boiling of water and melting of ice, only the physical state of water changes . Therefore, these both are physical changes.
  • In the case of melting of ice , only the physical state of water changes . Therefore, these both are physical changes.
  • When we dissolve salt in water, salt simply fits into the voids/gaps between the water molecules and no chemical property is changed. Hence, it is also a physical change.
  • However, during combustion of LPG, it reacts with oxygen to release CO 2 gas. This is a chemical change



So, the correct option is (d)

  1. Class 10
  2. Chapter 1 Class 10 - Chemical Reactions and Equations (Term 1)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo