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    Question

    Graphite and diamonds are

    __________.
    A isomers Correct Answer Incorrect Answer
    B isotones Correct Answer Incorrect Answer
    C isotopes Correct Answer Incorrect Answer
    D allotropes Correct Answer Incorrect Answer

    Solution

    Allotropes are different structural forms of the same element in the same physical state.   Graphite and Diamond are allotropes of carbon with different properties.    Graphite is soft and conducts electricity.   Diamond is hard and an electrical insulator.

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