Question

Assertion:Element and compounds are the examples of pure substances
Reason:The properties of a compound are different from those of its constituent element.
$A.$ Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$B.$ Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$C.$ Assertion is correct but Reason is incorrect
$D.$ Both the Assertion and Reason are incorrect

Answer 1

Hint:Pure substances are substances that are only made up of only one type of particle or atom and have a fixed or constant structure. Pure substances mainly have a constant or uniform composition throughout

Complete step by step answer:
 Let us discuss reason Assertion and Reason to find out the correct answer.
Pure substances are the substances that are made up of one type of atom of molecules. Thus Elements and compounds are the Example of pure substances. Example of elements and compounds
Elements; Carbon, Sulfur, Iron, Copper and aluminum
Compounds; Water $\left( {{H_2}O} \right)$, sodium chloride salt $\left( {NaCl} \right)$ and methane $\left( {C{H_4}} \right)$ .
The physical properties of a pure substance include well- defined physical properties such as melting point, boiling points, density and Atomic size.
The properties of a compound are different from those of its constituent elements

Both the Assertion and Reason are correct statements but are not related to each other. So, the correct option is $B.$

Additional information:
Elements: Element is defined as the substances that are made from one type of atom. An element cannot be broken down into any other substance. There are $92$ naturally occurring elements in the universe. Elements can be metal, non-metal, metalloids and noble gas.
Compounds: Compounds are the substances made from atoms of different elements joined by chemical bonds. Compounds are joined by various chemical bonds such as covalent bonds, Ionic bonds or metallic bonds. They can only be separated by a chemical reaction.

Note:
When different types of elements combine together physically and not by chemical bond, the substance formed is an impure substance known as mixture. Mixtures are two types of homogeneous and heterogeneous mixtures.