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Why is air from a natural source not considered a pure substance?

Answer and explanation

Correct answer: Because it is a mixture of many gases

The governing concept is the distinction between a pure substance and a mixture. A pure substance has a fixed composition and characteristic properties, whereas natural air contains several gases, mainly nitrogen and oxygen, along with argon, carbon dioxide, water vapour, and other trace substances. Their proportions can vary with location, altitude, weather, season, and pollution. Consequently, natural air does not have one fixed chemical formula and is classified as a mixture rather than a pure substance. Air still occupies space and has mass, so options B and C contradict fundamental properties of matter. It is also not always solid; under ordinary conditions it is gaseous. Therefore option A correctly identifies why natural air is not pure.

Related tags

AirMixturesPure SubstancesCompositionNature Of MatterSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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