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In different samples of pure CaCl₂, the percentage of elements remains the same. Which law is this?

Answer and explanation

Correct answer: Law of definite proportions

The governing concept is the law of definite proportions, also called the law of constant composition. It states that a particular pure compound always contains the same elements combined in a fixed ratio by mass, regardless of the source or quantity of the sample. Every sample of CaCl₂ therefore contains calcium and chlorine in the same mass relationship. The statement does not describe conservation of mass, which concerns total mass before and after a reaction. It also does not compare two different compounds, as required by the law of multiple proportions, and it is unrelated to gaseous volume ratios. Hence option D is correct.

Related tags

ChemistryLaws-Of-Chemical-CombinationDefinite-ProportionsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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