First slide

Alkaline earth metals

Question

Which of the following elements does not form hydride by direct heating with dihydrogen?

Moderate

A

Be
B

Mg
C

Sr
D

Ba

Solution

Except Be, all alkaline earth metals form hydrides(MH₂) on directly heating with H₂.
BeH₂ cannot be prepared by direct action of H₂ on Be. It is prepared by the action of LiAl H₄ on BeCl₂.
$2 {BeCl}_{2} + {LiAlH}_{4} ⟶ 2 {BeH}_{2} + LiCl + {AlCl}_{3}$

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