Among the alkaline earth metals ($Be$,$Mg$,$Ca$,and $Sr$) of group $IIA$,which one forms an ionic chloride?

An element reacts with hydrogen to form a compound $A$,which on treatment with water liberates hydrogen gas. The element can be

$A$ compound $x$ on heating gives a colourless gas. The residue is dissolved in water to obtain $y$. Excess $CO_2$ is bubbled through the aqueous solution of $y$ and $z$ is formed. $z$ on gentle heating gives back $x$. The compound $x$ is:

The compound$(s)$ of alkaline earth metals,which are amphoteric in nature is/are

How is calcium hydroxide prepared?

Electric furnaces are lined with magnesia because