Question

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

• A. $I,II,III$
• B. $I,III$
• C. $II,IV$
• D. $IV$ only

Answer 1

The correct option is A $I,II,III$

Interstitial compounds are those which are formed when small atoms like $H,C$ or $N$ are trapped inside the crystal lattices of metals.
$\left(I\right)$ They have high melting points, higher than those of pure metals.
$\left(II\right)$ They are very hard some borders approach dimond in hardness.
$\left(III\right)$ They retain metalic conductivity.
$\left(IV\right)$ They are chemically inert.