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

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

A

Be

B

Mg

C

Sr

D

Ba

Answer

Be

Explanation

Solution

: All the elements except beryllium combine with hydrogen upon heating to form their hydrides, MH2MH_{2} BeH2,BeH_{2}, however, can be prepared by the reaction of BeCl2BeCl_{2} with LiAlH4LiAlH_{4}

2BeCl2+LiAlH4→2BeH2+LiCl+AlCl32BeCl_{2} + LiAlH_{4} \rightarrow 2BeH_{2} + LiCl + AlCl_{3}