Q.1 Assertion: Both elements and compounds are called pure substances. Reason: They are made of same kinds of atoms or molecules. 1mark Q.2 Assertion: Constituents of a mixture retain their own properties. Reason: They are chemically mixed with each other.
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Pure substances are defined as substances that are made of only one type of atom or molecule. Thus Elements and compounds are the examples of pure substances.
The physical properties of a pure substance include well-defined melting and boiling points.
The properties of a compound are different from those of its constituent elements.
Both Assertion and reason are correct statements but are not related.
Hence, option B is correct
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