Question

Which of the following non metals show/s an exceptional physical property/ies?

• A. Graphite
• B. Diamond
• C. Both graphite and diamond
• D. Gold

Answer 1

The correct option is C

Both graphite and diamond

Some physical properties of non-metals:

(i)Non-metals are generally bad conductors of heat and electricity.

Exception : Graphite is a good conductor of electricity.
Non-metals do not conduct the electric current due to absence of free or mobile electrons, but graphite, due to presence of mobile electron is able to conduct electricity.

(ii)Non-metals are soft (Exception : Diamond)

(iii)Non-metals have low melting and boiling points. (Exception : Graphite has very high melting point (${3730}^{\circ }$C)