Question

why is graphite a good conductor of heat and electricity ?

Answer 1

 graphite is  a good conductor of heat and electricity because it was free electrons present in them therefore there is the possibility of flow of electrons in them as electricity is flow of electrons graphite can conduct electricity 

Answer 2

HELLO FRIENDS,
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Graphite a good conductor of heat and electricity because in its structure there are free electron which help in conducting electricity , since due to motion of electron the current is passed . 
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Best of luck ;)
ROYALJATT