Among the alkaline earth metals,the element forming predominantly covalent compounds is:

All the elements of group $2$ react with water to form metal hydroxide and hydrogen,except the element

Match the following alkaline earth metals with their respective densities $(g/cm^3)$:

$A$. $Be$	$I$. $1.74$
$B$. $Mg$	$II$. $1.84$
$C$. $Ca$	$III$. $2.63$
$D$. $Sr$	$IV$. $1.55$

Which of the following statement$(s)$ is/are correct?
$(i)$ $LiNO_3$ and $Ba(NO_3)_2$ both will give $NO_2$ on heating.
$(ii)$ $BaSO_4$ is less soluble in water than $CaSO_4$.
$(iii)$ Alkaline earth metals do not dissolve in liquid ammonia.

Which one of the following alkaline earth metals does not form hydride when it is heated with hydrogen directly?

Which one of the following statements is $NOT$ correct about the compounds of alkaline earth metals?