Which one of the following is not a physical change?
Which one of the following is not a physical change?
The correct option is D Combustion of LPG
1. Physical change
It is a temporary change. This does not involve any reactions. Here, there is no new bond formation or breaking of bonds. Here, only physical properties are changed.
2. Chemical change
A chemical change is a permanent change. It involves breaking or making bonds. The reactivity of a substance can be determined by its chemical properties.
3. Explanation
Option A. Melting of ice involves the formation of no new chemical substance both ice and water have the same chemical composition . Thus, it is a physical change.
Option B. Boiling of water involves the formation of no new substance and both water and steam have the same chemical formula . Thus, it is a physical change.
Option C. Dissolution of sugar in water involves the formation of no new substance. So, it is also a physical change.
Option D. Combustion is the chemical reaction in which oxygen is the reactant. Always a new product is formed during this reaction. So, the combustion of LPG is a chemical change.
Thus, option D is correct; the combustion of LPG is not a physical change.
Combustion of LPG
1. Physical change
It is a temporary change. This does not involve any reactions. Here, there is no new bond formation or breaking of bonds. Here, only physical properties are changed.
2. Chemical change
A chemical change is a permanent change. It involves breaking or making bonds. The reactivity of a substance can be determined by its chemical properties.
3. Explanation
Option A. Melting of ice involves the formation of no new chemical substance both ice and water have the same chemical composition . Thus, it is a physical change.
Option B. Boiling of water involves the formation of no new substance and both water and steam have the same chemical formula . Thus, it is a physical change.
Option C. Dissolution of sugar in water involves the formation of no new substance. So, it is also a physical change.
Option D. Combustion is the chemical reaction in which oxygen is the reactant. Always a new product is formed during this reaction. So, the combustion of LPG is a chemical change.
Thus, option D is correct; the combustion of LPG is not a physical change.
