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Which of the following is not an allotrope of Carbon?

  • A.Fullerenes
  • B.Diamond
  • C.Glass
  • D.Graphite

Answer: C

Glass is not an allotrope of carbon. It is an amorphous solid made chiefly of silicon dioxide.

Diamond, graphite and the fullerenes are all pure carbon in different structural forms, along with graphene, carbon nanotubes and amorphous carbon.

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