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An ionic alkali metal hydride has covale...

An ionic alkali metal hydride has covalent character to some extent and it does not react with oxygen and chlorine. This hydride is used in the synthesis of another hydride. Write the formula of the hydride and what happens when it reacts with `Al_(2)Cl_(6)`.

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Since the alkali metal hydride possess sufficient covalent character, the hydride is of the smallest alkali metal, Li, i.e. the hydride is LiH. As LiH is quite stable, it does not react with oxygen and chlorine. Lithium hydride reacts with `Al_(2)Cl_(6)` to form lithium aluminium hydride (LiAl`H_(4)`) which is extensively used as a reagent in synthesis of different organic compounds.
8LiH + `Al_(2)Cl_(6) rarr 2"LiAlH"_(4) + 6`LiCl
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