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If a substance has the same fixed composition in every sample what can it be?

Answer and explanation

Correct answer: Pure substance

A pure substance has a definite chemical composition and characteristic properties. This means that a sample taken from one part of the substance has the same types and relative amounts of particles as a sample taken from another part, as long as the substance has not been contaminated. Elements and compounds are examples of pure substances.

A mixture does not have one fixed composition in this sense; the proportions of its components can vary from sample to sample. A heterogeneous mixture is also non-uniform, so it cannot satisfy the stated condition. Therefore option A, pure substance, is correct. The description does not mean merely a clean-looking material, and it is not specifically a substance made only of dust.

Related tags

ChemistryNature-Of-MatterClass-11

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