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If a sample is a pure compound, how should the ratio of its elements be?

Answer and explanation

Correct answer: Fixed

The governing law is the law of definite proportions, also called the law of constant composition. It states that a pure chemical compound always contains the same elements combined in the same fixed mass ratio, regardless of where the sample comes from or how much of it is examined. Therefore, option B, fixed, is correct. The ratio need not be 1:1; for example, water has a fixed mass ratio of hydrogen to oxygen of 1:8, not equal masses. Option A describes a mixture, whose composition can vary, and option D is chemically meaningless for a compound containing elements. The word “pure” is important because impurities or mixtures can change the measured overall ratio.

Related tags

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

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