Question

Which of the following gas is/are called inert gas?

• A. $He$
• B. $Ne$
• C. $Kr$
• D. All of these

Answer 1

The correct option is D All of these

All these gases have closed shell structure and no unpaired electron in their orbital.

They are from noble gas family and also called inert gases due to their low reactivity.

$He,Ne,Ar,Kr,Xe$ and $Rn$ is family of inert gas.

Option D is correct.