Which of the following substances does not release $O_2$ and acts as a dehydrating agent?

Which of the following facts are the evidence for the ionic nature of $LiH$?

Match the correct option from Column $-A$ and Column $-B$.

Column $-A$	Column $-B$
$(1)$. $VH$	$(a)$. Ionic hydride
$(2)$. $HF$	$(b)$. Metallic hydride
$(3)$. $MgH_2$	$(c)$. Electron precise hydride
$(4)$. $B_2H_6$	$(d)$. Molecular hydride

Given below are two statements :
Statement-$I$: The process of producing syn-gas is called gasification of coal.
Statement-$II$: The composition of syn-gas is $CO + H_2$ ($1 : 1$ ratio).
In the light of the above statements,choose the most appropriate answer from the options given below:

The most dangerous method of preparing hydrogen would be by the action of $HCl$ and

How do you expect the metallic hydrides to be useful for hydrogen storage? Explain.