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Which statement correctly explains the scope of definite proportions?

Answer and explanation

Correct answer: It applies to pure compounds not mixtures

The direct answer is A. The law of definite proportions applies to a pure chemical compound: its elements are present in a fixed ratio by mass, regardless of where the pure sample comes from. A is correct because mixtures can have changing composition, so the law is not applied to mixtures as mixtures. B is wrong because a drink may be a mixture and its ingredients can vary. C is wrong because the law is not limited to gas litres; it concerns composition by mass. D is wrong because an open vessel is not the defining condition. To solve such questions, first identify pure compound versus mixture. Memory cue: pure compound has fixed composition; mixture can vary.

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