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Question

Which of the following is a non-metallic conductor:
  1. Cs
  2. coke
  3. diamond
  4. graphite

A
diamond
B
graphite
C
Cs
D
coke
Solution
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Each C atom in hexagonal ring in graphite undergoes sp2 hybridisation and make 3 sigma bonds with 3 neighbouring carbon atoms. 4th electron forms a π bond. These electrons are delocalised over the whole sheet which results in conductivity.

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