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In which situation will a substance be considered a pure compound?

Answer and explanation

Correct answer: When elements are chemically combined in a fixed ratio

A pure compound is a substance formed when two or more different elements combine chemically in a definite, fixed proportion by mass. Its composition and properties remain uniform from sample to sample, and it can be separated into its elements only by a chemical process, not by simple physical methods. Therefore, option A gives the essential criterion: chemically joined elements in a fixed ratio. Hand-mixing produces a mixture, while visible layers indicate physical separation or immiscibility. A composition that changes from sample to sample is also a property of a variable mixture, not a pure compound. The governing idea is the law of definite proportions.

Related tags

ChemistryNature-Of-MatterPure-CompoundDefinite-ProportionsNature Of MatterSome Basic Concepts Of ChemistryClass 11 Mcq

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