Question

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

• A. $Be$
• B. $Mg$
• C. $Sr$
• D. $Ba$

Answer 1

Answer: (A)

$Be$

Answer 2

All the elements except beryllium combine with hydrogen upon heating to form their hydrides, $MH_2$. $BeH_2$, however, can be prepared by the reaction of $BeCl_2$ with $LiAlH_4$. $2BeCl_2+LiAlH_4 \to 2BeH_2+LiCl +AlCl_3$