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  1. Which of the following is not a noble gas ?

    2. A.

     Hydrogen
    B.

     Helium
    C.

     Neon
    D.

     Argon

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    Answer : Option A

    Explanation :

    Hydrogen is not a noble gas as it has one electron in its shell and it is not stable unlike noble gases which are having 2,8,8 electrons in their outer shell.

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