JEE Main · 2023 · 30 Jan 2023 · Shift 1 · Hydrogen

Lithium aluminium hydride can be prepared from the reaction of

(A)LiCl and $Al_{2} H_{6}$
(B)LiH and $Al_{2} Cl_{6}$ ✓ Correct
(C) $LiCl, Al$ and $H_{2}$
(D)LiH and $Al (OH)_{3}$

Answer: (B)

Solution

Lithium aluminium hydride is made by the action of lithium hydride on aluminium chloride in dry ether, the chloride written as its dimer:

8 LiH + A l_{2} C l_{6} \to 2 LiAl H_{4} + 6 LiCl

. Hydride ions are handed to aluminium to build the tetrahedral

Al H_{4}^{-}

anion, while the surplus lithium ends up as lithium chloride. The reagents that give lithium aluminium hydride are lithium hydride and aluminium chloride dimer.

JEE Main · 2023 · 30 Jan 2023 · Shift 1 · Single correct option

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