Question

Give two examples of interstitial hydrides.

Answer 1

Hint:We must first know what an interstitial hydride is. Interstitial hydride is also known as metallic hydride involves hydrogen bonds with transition metals. These hydrides are nonstoichiometric which means that the fraction of hydrogen atoms to the metals are not fixed. These Hydrides are produced by heating the metal with hydrogen under high pressure.

Complete answer:
Interstitial hydride or metallic hydrides are formed by the elements of group $3,4,5,10,11,12$, d-block and f-block elements. From group $6$ only $Cr$ forms the hydride and metals of groups $7,8{\text{ and 9}}$ do not form hydrides. This region which does not form hydrides is called a hydride gap.
Interstitial hydrides are called as such, because in these compounds, hydrogen occupies the interstitial sites in the metal lattice without changing the type of the lattice.
Nonstoichiometric compounds have a variable composition. The idea and basis for this is that with metal and hydrogen bonding there is a crystal lattice that hydrogen atoms can and may fill in between the lattice while some might, and is not a definite ordered filling. Thus it is not a fixed ratio of hydrogen atoms to the metals. Even then metallic hydrides consist of more basic stoichiometric compounds as well.
Two examples of interstitial hydrides are $CuH,FeH$

Note:
Properties of metallic hydrides are:
They are hard, show magnetic properties and conduct electricity.
They are formed by the distortion of crystal lattice because of the inclusion of hydrogen in the interstitial sites in the metallic lattices therefore it is called as the interstitial lattices.