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Which is the correct difference between a pure substance and a mixture?

Answer and explanation

Correct answer: Pure substance has fixed composition and mixture can have variable composition

The governing concept is the distinction between a pure substance and a mixture by composition and separability. A pure substance contains one kind of matter and has a definite, uniform composition; a compound such as water has elements in a fixed ratio. A mixture contains two or more substances physically combined, so the proportion of its components may vary from sample to sample. Therefore option D is correct. Option A wrongly assigns variable composition to pure substances, B confuses formation with classification, and C is incorrect because every pure substance has a definite composition.

Related tags

Pure SubstanceMixtureComposition Of MatterNature Of MatterSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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