A non-metallic element X is a good conductor of electricity in one form and is a bad conductor of electricity in another form. Comment on thethermal conductivity of both forms. Identify theelement and mention the above two forms ofX.

A non-metallic element X is a good conductor of electricity in one for

1.	A non-metallic element X is a good conductor of electricity in one form and is a bad conductor of electricity in another form. Comment on thethermal conductivity of both forms. Identify theelement and mention the above two forms ofX.
Answer» Solution :Carbon OCCURS as graphite and diamond in free state. Graphite is a good conductor of electricity and diamond is a bad conductor of electricity . So the element 'X' is carbon and the TWO forms of X are graphite and diamond. Diamond is a good thermal conductor whereas graphite it a poor thermal conductor.