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If composition of a material changes from sample to sample why is it not a good example of definite proportions?

Answer and explanation

Correct answer: Because it may be a mixture

According to the law of definite proportions, a pure compound contains its constituent elements in a fixed mass ratio, regardless of the sample source. If the composition changes from one sample to another, the material may be a mixture because the proportions of components in a mixture can vary. Options B and C describe a pure compound, so they do not explain the stated observation. Exam tip: variable composition indicates a mixture; fixed composition indicates a pure compound.

Related tags

ChemistryLaw Of Definite ProportionsChemical CombinationMixturesPure CompoundsClass 11Laws Of Chemical CombinationSome Basic Concepts Of Chemistry

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