Question

if graphite is a form of carbon and it is a conductor of electricity, then why coal which is also a form of carbon not a conductor of electricity?​

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Answer 1

Answer:

Any conductor has electrons in its conduction band that is their conduction and valence band overlap, any semiconductor has a very short gap between valence band and conduction band however insulators have a very high band gap between conduction and valence band that means no free electrons to conduct electricity . graphite has a layered structure with free electrons in between those layers each carbon in graphite is sp2 hybridised so each carbon has a free electron hence a good conductor of electricity . In case of coal it is an amorphous mixture of carbon and other compounds such as sulphur nitrogen oxygen, no free electrons in these non metals hence does not conduct electricity .