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Which statement is correct about definite proportions?

Answer and explanation

Correct answer: The mass ratio of elements in a pure compound is fixed

The governing concept is Proust’s law of definite proportions. It states that a particular pure compound always contains the same elements combined in the same fixed ratio by mass, regardless of where the sample comes from or how it is prepared. For example, pure water contains hydrogen and oxygen in a mass ratio of 1:8. Therefore option A is correct because it refers specifically to a pure compound and a fixed mass ratio. A mixture, in contrast, can have variable composition, so option B is false. Elements need not be present in equal amounts, making option C false. Option D is unrelated and scientifically incorrect because gases occupy volume. The words “pure compound” and “fixed mass ratio” identify the correct principle.

Related tags

Definite ProportionsProustCompound CompositionLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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