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Which option correctly shows fixed composition of a pure compound?

Answer and explanation

Correct answer: Ratio of silicon and oxygen in pure SiO₂

A pure compound has elements chemically combined in a definite and constant proportion by mass. Pure silicon dioxide, SiO₂, always contains silicon and oxygen in the fixed ratio determined by its chemical formula, so option C is correct. Soil, tea, and air are mixtures, not pure compounds; their amounts of sand, sugar, or dust can vary from sample to sample. A formula such as SiO₂ represents a definite composition, whereas a mixture has no single fixed formula and its components can be separated physically. Therefore, the governing concept is the law of definite proportions, and only the pure SiO₂ example satisfies it.

Related tags

Law Of Definite ProportionsPure CompoundSio2MixturesLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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