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    Question

    Diamond and graphite are

    :
    A Isomers Correct Answer Incorrect Answer
    B Isotopes Correct Answer Incorrect Answer
    C Polymers Correct Answer Incorrect Answer
    D Allotropes Correct Answer Incorrect Answer

    Solution

    When an element exists in more than one crystalline form, those forms are called allotropes; the two most common allotropes of carbon are diamond and graphite.

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