Assertion: Element and compounds are the examples of pure substances

Reason: The properties of a compound are different from those of its constituent element.

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Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Assertion is correct but Reason is incorrect

Both the Assertion and Reason are incorrect

answer is B.

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Detailed Solution

Concept- Pure substances are those that have a fixed composition and exhibit the same properties even in different places and at different times.
Pure substances are elements and compounds. So the statement is correct.
Elements are substances that are made up of a single type of atom. Example-

He, Na, B, F_{2}

All elements are represented by a chemical symbol and are arranged in order of increasing atomic number in the periodic table.
Compounds are homogeneous substances formed by combining 2 or more elements in a fixed mass ratio. The basic elements of a compound cannot be extracted by physical methods. The properties of a compound are completely different from its constituent particles. So the reason is correct, but not the reason for the claim.
So the correct answer is 2.

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