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Sublimation of camphor is an example of which change?

Answer and explanation

Correct answer: Physical change

The direct answer is option A: physical change. Sublimation is the direct change of a solid into vapour without first becoming a liquid. Camphor changes its state and gradually disappears into vapour, but its basic substance remains camphor; no new substance is required in this process. Therefore it is a physical change. Option A is correct because change of state without formation of a new substance is physical. Option B is wrong because a chemical change forms a new substance with new composition or properties. Option C, rusting, is a chemical process in which iron compounds form, not sublimation. Option D, fermentation, is also a chemical process involving conversion of substances by microorganisms. The word “sublimation” describes a physical state change, although the vapour should not be inhaled unnecessarily. Memory cue: solid directly to gas, with no new substance, means physical sublimation.

Related tags

ChemistryNature-Of-MatterClass-11

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