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In which example is definite proportions used correctly?

Answer and explanation

Correct answer: Fixed mass ratio of sodium and chlorine in pure NaCl

According to the law of definite proportions, the constituent elements of a pure compound are always present in a fixed ratio by mass. In pure NaCl, sodium and chlorine have a fixed mass ratio, so option A is correct. Tea, air, and soil are mixtures, and the amounts of their components can vary. Exam tip: a fixed composition indicates a compound, whereas a variable composition indicates a mixture.

Related tags

Law Of Definite ProportionsPure CompoundsMixturesChemical CompositionClass 11 ChemistryLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistry

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