Multiple choice

Diamond is harder than graphite, though both of them are allotropes of carbon. This is due to the

  1. hexagonal structure of diamond

  2. difference in their electronic configuration

  3. difference in the size of their crystals

  4. difference in the strength of their respective intermolecular forces
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A Correct answer
Explanation

 Diamond is harder than graphite, though both of them are allotropes of carbon due to the hexagonal structure of diamond.

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