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Which statement correctly gives the scope of the law of definite proportions?

Answer and explanation

Correct answer: It applies to pure compounds, not mixtures

The law of definite proportions, also called the law of constant composition, states that a particular pure compound always contains the same constituent elements in the same fixed proportion by mass, regardless of the source or amount of the sample. Therefore, option A correctly describes its scope. A mixture or solution can have variable composition because its components may be present in different amounts, so options B and the mixture-related interpretation are wrong. The law is not restricted to gases or to open vessels; consequently, options C and D introduce conditions that are not part of the law.

Related tags

ChemistryDefinite ProportionsComposition Of CompoundsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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