Generally, non-metals are not conductors of electricity. Which of the following is a good conductor of electricity?

(a) Diamond

(b) Graphite

(c) Sulphur

(d) Fullerene

Answer: (b) Graphite

Reason: Normally non-metals do not transmit heat and electricity, however, graphite is different. Graphite (an allotropic form of carbon) can conduct electricity and is used to make electrodes.