Assertion ( A) `:` Graphite is a good conductor of electricity. However diamond belongs to the category of insulators.
Reason ( R ) `:` Graphite is soft in nature on the other hand diamond is very hard and brittle.

Options

A. Both assertion and reason are true and reason is the correct explanation of assertion.
B. Both assertion and reason are true but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false
D. Both assertion and reason are false.

Answer

b

Explanation

Graphite is an electrical conductor, hence useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity). These valence electrons are free to move, so are able to conduct electricity.