Many transition metals form interstitial compounds. The characteristics of these interstitial compounds are:

I) they have high melting points

II) they are very hard

III) they retain metallic conductivity

IV) they are chemically more reactive than the pure metals.

Q. Many transition metals form interstitial compounds. The characteristics of these interstitial compounds are:
(I) They have high melting points, higher than those of pure metals
(II) They are very hard
(III) They retain metallic conductivity
(IV) They are chemically more reactive than the pure metals

Q. Many transition metals from interstial compounds. Which of the following characteristics of these interstitial compounds is/are correct :
$\left(I\right)$ They have high melting points, higher than those of pure metals

$\left(II\right)$ They are very hard

$\left(III\right)$ They retain metalic conductivity

$\left(IV\right)$ They are chemically more reactive than the pure metals

Q. Which of the following statements are true for pure substances?
(i) They contain only one kind of particles.
(ii) They can be compounds or mixtures.
(iii) They have the same composition throughout the substance.
(iv) They are formed by the physical combination of substances.

Q.

Which of the following is/are incorrect about solids?​
I) They have weak interparticle force of attraction.​
II) They are rigid and compressible.​
III) They have negligible interparticle spaces.​

A. Only I​
B. Only II​
C. Both I and II​
D. Both II and III

Q. What are interstitial compounds? Why do these compounds have higher melting points than corresponding pure metals?