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Into how many main types are pure substances classified?

Answer and explanation

Correct answer: Two types—elements and compounds

A pure substance has a uniform, definite composition and consistent properties throughout the sample. On the basis of chemical composition, pure substances have two main classes: elements and compounds. An element contains only one kind of atom and cannot be decomposed into simpler substances by ordinary chemical means. A compound contains two or more elements chemically combined in a fixed ratio and can be decomposed chemically. Therefore option A is correct. Solid, liquid, and gas in option B are physical states, not chemical classes, while option C mixes unlike categories and includes examples rather than a valid classification.

Related tags

Pure SubstancesElementsCompoundsNature Of MatterSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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