A particular solid is very hard and has a very high melting point.In solid state it is nonconductor and its melt is a conductor of electricity. Classify the solid.

Options

A. Metallic
B. Molecular
C. Network
D. Ionic

Answer

4

Explanation

In ionic solids the constituent particles are positive and negative ions.Because of strong electrostatic forces of attraction the ions are closely packed and hence ionic solids are hard.
They are electrical insulators in the solid state because their ions are not free to move about ,However, in the aqueous solutions or in the molten state,they are good conductors of electricity because ions becomes free.