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Assertion: The group 18 consists of elements which are in gaseous state under ordinary conditions
Reason: All the elements of group 18 have stable configuration


  1. Both assertion and reason are true and reason is the correct explanation of assertion

  2. Both assertion and reason are true but reason is not the correct explanation of assertion

  3. Assertion is true but reason is false

  4. Both assertion and reason are false


Solution

The correct option is B

Both assertion and reason are true but reason is not the correct explanation of assertion


The members of the group have eight electrons in their outermost orbit (except helium which has two electrons). Thus, they have a stable configuration. Group 18 elements are gases and chemically unreactive, which means they don’t form many compounds. Thus, the elements are known as inert gases.  

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