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In different samples of pure CH₄, the percentage of elements remains the same. Which law is this?

Answer and explanation

Correct answer: Law of definite proportions

The governing idea is constant composition. The law of definite proportions says that every pure sample of a given compound contains its constituent elements in an unchanging mass ratio. Methane, CH₄, therefore has the same carbon and hydrogen percentages in every pure sample, although the total mass of the samples may differ. This is not the conservation of mass, because no reaction or before-and-after mass comparison is described. It is not multiple proportions, because that law compares different compounds formed by the same elements. It is also not the law of gaseous volumes, which concerns volume ratios of reacting gases under suitable conditions. Hence option C correctly names the law.

Related tags

ChemistryConstant-CompositionDefinite-ProportionsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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