Question
Graphite : Diamond : Coke
Options:
A .  Electrodes
B .  Fuels
C .  Abrasives
D .  Allotropes
Answer: Option D
Answer: (d)Allotropes are the existence of a chemical element in two or more forms, Which may differ in the arrangement of atoms in crystalline solids or in the occurrence of molecules that contains different numbers of atoms.

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