The ionic hydride of an alkali metal which has a significant covalent character and is almost unreactive towards oxygen and chlorine at moderate temperatures is Lithium hydride (LiH).
It is therefore used in synthesis of other useful hydrides.
Reaction of LiH with Al2Cl6 is- 8LiH + Al2Cl6→ 2LiAlH4 + 6LiCl
In this way LiH was useful in preparation of LiAlH4 which is an important hydride (often used as reducing agent in many organic reactions).
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