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Which statement shows correct experimental understanding of definite proportions?

Answer and explanation

Correct answer: Different samples of the same pure compound give same composition

The direct answer is A: different samples of the same pure compound give the same composition. The law of definite proportions states that a particular pure compound always contains the same elements in the same fixed proportion by mass, regardless of where the sample comes from or how large it is. For example, every pure sample of water contains hydrogen and oxygen in a fixed mass ratio. Option A correctly describes testing different samples and observing the same composition. Option B is wrong because mixtures can have variable composition; their components may be present in different amounts. Option C is wrong because the amount of sugar in tea can change from cup to cup, and tea is generally a mixture. Option D is wrong because soil contains many substances and is not always a pure compound. The key words are “same pure compound,” “different samples,” and “same composition.” The law concerns fixed chemical composition, not appearance or everyday recipes. Remember: pure compound, same elements, fixed mass ratio.

Related tags

Chemistry Laws CombinationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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