Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following are the characteristic properties of interstitial compounds?
I. They have high melting points in comparison to pure metals.
II. They are very hard.
III. They retain metallic conductivity.
IV. They are chemically very reactive.

Options

A. I, II and III only
B. I and III only
C. II and IV only
D. IV only

Answer

A