$BeCl_2$ reacts with $LiAlH_4$ to give ....

Match List-$I$ with List-$II$ for the compositions of substances and select the correct answer using the codes given below.

List-$I$ (Substances)	List-$II$ (Composition)
$A$. Plaster of Paris	$i$. $CaSO_4 \cdot \frac{1}{2} H_2O$
$B$. Epsomite	$ii$. $MgSO_4 \cdot 7H_2O$
$C$. Kieserite	$iii$. $MgSO_4 \cdot H_2O$
$D$. Gypsum	$iv$. $CaSO_4 \cdot 2H_2O$
	$v$. $CaSO_4$

$CaCO_3$ was reacted with dil $HCl$ to form three products. One of the products formed,when passed into slaked lime,gave $X$. What is $X$?

$A$ metal $M$ readily forms a water-soluble sulfate $MSO_4$,a water-insoluble hydroxide $M(OH)_2$,and an oxide $MO$ which becomes inert upon heating. The hydroxide is soluble in $NaOH$. What is $M$?

Identify the correct statements from the following:
$I$. All alkaline earth metals give hydrides on heating with hydrogen.
$II$. Calcium hydroxide is used to purify sugar.
$III$. $BeCl_2$ is a dimer in gaseous phase.

What is the order of basic strength for the hydroxides of the following alkaline earth metals?