Answer:
\[LiH\]is first reacted with
anhydrous aluminium chloride. The reaction is carried out in ether.
\[8LiH+A{{l}_{2}}C{{l}_{6}}\xrightarrow{Ether}2LiAl{{H}_{4}}+6LiCl\]
\[LiAl{{H}_{4}}\]is used for the
preparation of beryllium hydride.
Beryllium chloride is reacted
with L\[LiAl{{H}_{4}}\] to form beryllium hydride.
\[2BeC{{l}_{2}}+LiAl{{H}_{4}}\to
2Be{{H}_{2}}+LiCl+AlC{{l}_{3}}\]
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