Question

Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not characteristic property of interstitial compounds?

• A. They are chemically very reactive.
• B. They are very hard.
• C. They have high melting points in comparison to pure metals.
• D. They retain metallic conductivity.

Answer 1

The correct option is A

They are chemically very reactive.

Interstitial compounds :
Interstitial compounds are non-stoichiometric compounds in which small atoms like hydrogen, carbon etc., occupy the interstitial sites in a lattice.



Characteristics of the interstitial compounds :

• Interstitial compounds have higher melting points than pure metals.

• Interstitial compounds are very hard and rigid.

• Interstitial compounds show conductivity like pure metals.

• Interstitial compounds are chemically inert.

Thus, option $\left(D\right)$ contradicts the property of interstitial compounds. Therefore, the statement given in option $\left(D\right)$ is incorrect.

So, option $\left(D\right)$ is the correct answer.