A) potassium
B) sodium
C) graphite
D) diamond
Correct Answer: C
Solution :
Graphite an allotrope of carbon is a good conductor of electricity. Each carbon atom in graphite is \[S{{P}^{2}}\]hybridised. The unhybridised p-orbitals overlap sideways with each other to form \[\pi \] clouds. The electrical conductivity can be attributed to mobile (delocalised) \[\pi \] electrons.
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