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Question

Why graphite is a conductor but not a diamond?


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Solution

Graphite:

  • Graphite is a crystalline allotropic form of carbon.
  • It is a soft black lustrous form of carbon that conducts electricity.

Graphite is a conductor but not diamond because:

  • In graphite, each carbon atom is linked to three carbon atoms via a C-C covalent bond. The fourth electron is delocalized so it is mobile and can conduct electricity.
  • But diamonds have no free electrons because each carbon is four other carbon atoms covalently bonded in a tetrahedral manner.
  • So, it has been said that diamonds are bad conductors of electricity.

Hence, graphite is a conductor but diamond is a bad conductor.


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