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In different samples of pure Na₂O, the percentage of elements remains the same. Which law is this?

Answer and explanation

Correct answer: Law of definite proportions

The law being tested is the law of definite proportions, also known as the law of constant composition. A pure compound has a definite formula and therefore contains its constituent elements in a fixed mass ratio. Consequently, every pure sample of Na₂O has the same relative amounts of sodium and oxygen by mass, even when the samples have different total masses. Conservation of mass would require a chemical reaction and a comparison of total mass before and after it. Multiple proportions concerns two or more different compounds made from the same elements. Gaseous volumes concerns volume relationships in gas reactions. Since the stem emphasizes different samples of one pure compound and identical percentages, option D is the only suitable answer.

Related tags

ChemistryDefinite-ProportionsConstant-CompositionLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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