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  1. Which one is not a pure form of carbon?

    2. A.

     Coal
    B.

     Graphite
    C.

     Diamond
    D.

     Gold

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    Answer : Option D

    Explanation :

    There are many pure forms of carbon in earth, but Diamond is the purest form of carbon. Other pure forms are graphite, fullerene and charcoal. Gold is not a form of carbon.

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