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Crystal Lattice and Unit Cell

Which of the ...

Question

Which of the following is a non-metallic conductor:

A

Cs

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B

coke

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C

diamond

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D

graphite

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Solution

The correct option is D graphite
Each C atom in 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.

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