Which of the following is a conductor of electricity?

Diamond

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Coke

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Graphite

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Charcoal

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Solution

The correct option is C Graphite
Each C atom in the hexagonal ring in graphite undergoes $s p^{2}$ 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.

Option C is correct.

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