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An ionic hydride of an alkali metal ha...

An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine . This is used in the synthesisi of other useful hydrides. Write the formula of this is used in the synthesis of other hydrides. Write the formula of this hydride. Write its reaction with `Al_(2)Cl_(6)`.

Text Solution

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Since the ionic hydride of alkali metal has significant covalent character, therefore, it is LiH. Since LiH is very stable, therefore, it is almost unreactive towards `O_2` and `Cl_2`.
It reacts with `Al_2 Cl_6` to form lithium aluminium hydride
`8LiH + Al_2 Cl_6 to 2LiAlH_4 + 6LiCl`
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