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What change occurs in sublimation?

Answer and explanation

Correct answer: Solid changes directly into gas

Sublimation is a change of state in which a solid changes directly into a gas without first becoming a liquid. The particles at the surface gain enough energy to leave the solid structure and enter the gaseous state. The reverse change, from gas directly to solid, is called deposition, so it should not be confused with sublimation.

Common school examples include camphor and iodine, which can form vapour when heated without producing an ordinary liquid stage under suitable conditions. Therefore option A is correct. Option B describes freezing, option C describes condensation, and option D describes melting. The essential identifying point is that the liquid state is skipped during sublimation.

Related tags

ChemistryNature-Of-MatterClass-11

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