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Pure substances can be divided into which two classes?

Answer and explanation

Correct answer: Elements and compounds

The governing concept is the classification of matter according to composition. A pure substance has a fixed, uniform composition and consists of only one kind of chemical substance. Pure substances are divided into elements and compounds. An element contains only one type of atom and cannot be broken into simpler substances by ordinary chemical methods; a compound contains two or more elements chemically combined in a fixed ratio and can be decomposed chemically. Therefore option B is correct. Solid and gas in option A are physical states, not composition classes. Homogeneous and heterogeneous usually describe mixtures, while acids and metals are not complementary classes of all pure substances. Mixtures are excluded because their composition can vary.

Related tags

ChemistryNature-Of-MatterPure-SubstancesNature Of MatterSome Basic Concepts Of ChemistryClass 11 Mcq

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