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     Consider the following statements regarding diamond

    1. It is an allotrope of silicon
    2. It is a bad conductor of heat and electricity
    3. It is the hardest substance
    4. It burns to produce carbon dioxide

    Which of the statements given above are correct?

  • 1, 2, 3 and 4
  • 2, 3 and 4 only
  • 1 and 2 only
  • 1, 3 and 4 only
  • Explanation:

    Diamond and graphite are allotropes of carbon.