Question

01. Which of the following is not physical change *
2 points
1.Boiling of water to give water vapour
2.Melting of ice to give water
3.Dissolution of salt in water
4.Combustion of Liquid Petroleum Gas (LPG)​

Answer 1

Answer:

A physical change involves only change in physical state whereas a chemical change results the formation of new substances. Boiling of water, melting of ice and dissolution of salt are physical changes as no new products are formed.

(a) Boiling of water to give water vapor : It is a physical change because there is changes in the phase from liquid state to gaseous state. (b) Melting of ice to give water : It is a physical change because there is changes in the phase from solid state to liquid state.

LPG are flammable hydrocarbon gases, which react with oxygen to form new products as carbon dioxide (CO2) and water (H2O). Therefore, combustion of LPG is a chemical change.

So, Option D is correct.

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