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Which allotrope of carbon is in the form of a rigid three dimensional structure ?
1. Graphite
2. Fullerene
3. Diamond
4. Lamp black

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Correct Answer - Option 3 : Diamond

The correct answer is Diamond.

  • Diamond is in the form of a rigid three-dimensional structure.
  • Allotrope refers to one or more physical forms of a chemical element that occurs in the same physical state.
  • Carbon due to its capability of having variable oxidation states or coordination numbers has allotropic forms.
  • Some of the allotropes of carbon-
    • Diamond
      • It is an extremely hard and transparent crystal.
      • The carbon atoms are arranged in a tetrahedral lattice.
      • It is a poor electrical conductor and an excellent thermal conductor.
    • Fullerenes
      • It has 60 atoms of carbon.
      • It is also known as “buckyballs”.
      • It can be used as an antioxidant because it can easily react with radicals due to the high affinity of the electron.
    • Graphite
      • It is a pure form of carbon.
      • This allotrope of carbon is composed of flat two-dimensional layers of carbon atoms which are arranged hexagonally.
      • Since the layers are stacked over each other, this carbon allotrope can act as a lubricant.
    • Lampblack is a finely powdered black soot deposited in incomplete combustion of carbonaceous materials

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