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WBCS Preliminary Examination 2020 — General Studies · Question 117 of 200

Q117
General ScienceChemistry
Graphite, carbon and diamonds are
  1. a.isotopes
  2. b.isomers
  3. c.isotones
  4. d.allotropes

Answer: (D) allotropes

Graphite and diamond are different structural forms of the same element, carbon — making them allotropes, not isotopes or isomers.