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)
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)