Graphite is a good conductor of electricity due to the presence of __________.
(i) lone pair of electrons
(ii) free valence electrons
(iii) cations
(iv) anions
The answer is the option (ii) Every carbon atom is bonded to 3 other carbon atoms in graphite by covalent bonds. One valence electron of each carbon atom is free. Graphite is a good conductor of electricity due to the presence of this free electron.