Which of the following statement is incorrect about compound?

A compound is a pure substance composed of two or more elements

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A compound is combined chemically in fixed proportion

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A compound is combined chemically in variable proportion

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All compounds are molecules, but not all molecules are compounds

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Solution

The correct option is C A compound is combined chemically in variable proportion
Compound is a pure substance made up of two or more elements combined chemically in a definite ratio or fixed proportion.
Hence option $C$ is incorrect.

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