Assertion: Compounds are impure substances.
Reason: Substances containing two or more elements are considered pure.

Both assertion and reason are correct and reason is the correct explanation for assertion.

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Both assertion and reason are correct but reason is not the correct explanation for assertion.

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Assertion is correct but the reason is incorrect.

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Both the assertion and the reason are incorrect.

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Solution

The correct option is D Both the assertion and the reason are incorrect.
Pure substances are made up of only one kind of particle.
Impure substances are composed of 2 or more different elements.
Compounds are made up of one kind of molecule and that molecule is made up of 2 or more kinds of atoms in a fixed ratio. Compound is a pure substance.

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Elements and compounds are pure substances.

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