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Boiling of water is an example of which change?

Answer and explanation

Correct answer: Liquid to gas

The direct answer is A: liquid to gas. Boiling occurs when a liquid is heated to its boiling point and changes throughout the liquid into a gas or vapour. Water in a vessel is liquid; on sufficient heating, it becomes water vapour. Thus the direction is liquid → gas. Option A is correct. Option B, gas to liquid, is condensation, such as steam cooling into water. Option C, solid to liquid, is melting, such as ice becoming water. Option D, liquid to solid, is freezing or solidification, such as water becoming ice. Boiling and evaporation both represent liquid-to-gas change, although boiling occurs throughout the liquid at its boiling point while evaporation can occur from the surface at many temperatures. Memory cue: heating generally gives melting and then boiling: solid → liquid → gas.

Related tags

ChemistryNature-Of-MatterClass-11

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