Q.

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

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a

Be

b

Mg

c

Sr

d

Ba

answer is A.

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Detailed 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 BeCl2.2BeCl2+LiAlH4⟶2BeH2+LiCl+AlCl3
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