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Which of the following statements correctly expresses the law of definite proportions?

Answer and explanation

Correct answer: In a pure compound, the constituent elements are always present in a fixed ratio by mass.

The law states that a pure compound has a constant composition by mass; for example, water always contains hydrogen and oxygen in the mass ratio 1:8. Option B is incorrect even under conservation of mass. Exam tip: look for “fixed mass ratio.”

Related tags

Law Of Definite ProportionsChemical CombinationConstant CompositionClass 11 ChemistryBasic Chemistry LawsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistry

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