The s-block Elements — Chemistry STD 11 Science — Question
Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe s-block Elements1 Mark
MCQ
Which of the following elements does not form hydride by direct heating with dihydrogen?
✓
$Be$
B
$Mg$
C
$Sr$
D
$Ba$
✓
Answer
Correct option: A.
$Be$
Olny $\ce{BeH_2}$ cannot be prepared by direct combination with $\ce{H_2}$ in group $II$. It is prepared by reacting $\ce{BeCl_2}$ with $\ce{LiAlH_4}$.
$2\text{BeCl}_2+\text{LiAlH}_4\xrightarrow{\ \ \ \ \ \ \ }2\text{BeH}_2+\text{LiCl}+\text{AlCl}_3$
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