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Water becoming vapour is what type of change?

Answer and explanation

Correct answer: Physical change

The governing concept is the distinction between physical and chemical changes. When liquid water becomes vapour, only its physical state changes from liquid to gas. The substance remains water and its chemical composition is still H₂O before and after vaporisation. Heating increases the molecules’ kinetic energy and separates them more widely, but it does not create a new substance. Cooling the vapour can reverse the process by producing liquid water again, which further supports its classification as a physical change. Therefore option B is correct. Rusting and combustion are chemical changes because they produce new substances. Option A is too broad and is specifically wrong here because the chemical identity of water remains unchanged.

Related tags

Physical ChangeStates Of MatterWater VapourNature Of MatterSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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