$A$ solid which is very hard,has a very high melting point in the solid state,is an insulator,and becomes a conductor of electricity in its molten state is a/an ..... solid.

Which among the following materials is extensively used as a piezoelectric material?

To prepare $p$-type semiconductors,which type of impurity is added to intrinsic semiconductors?

'Stability of a crystal is reflected in the magnitude of its melting points'. Comment. Collect melting points of solid water,ethyl alcohol,diethyl ether and methane from a data book. What can you say about the intermolecular forces between these molecules?

Which among the following statements is $NOT$ true about covalent network solids?

Diamond is an example of