Which of the following is a non-metallic conductor:
Cs
coke
diamond
graphite
A
diamond
B
graphite
C
Cs
D
coke
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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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