A hard substance mells at high temperature andis an insulator in both solid and in molten state. This solid is most likely to be a / an :

Question

Accepted Answer

Correct answer: D. (d) Covalent or network solid have very high melting point and they are insulators in their solid and molten form.

$A hard substance mells at high temperature andis an insulator in both solid and in molten state. This solid is most likely to be a / an :$