When $CO_2$ gas is passed through lime water,it turns milky. On passing excess $CO_2$ gas,the milkiness disappears because:

$A$ 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:

Which alkaline earth metal sulfate has a hydration enthalpy value greater than its lattice enthalpy value?

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

Among the metals $Be$,$Mg$,$Ca$,and $Sr$ of group $IIA$,which one forms the least ionic chloride in the periodic table?

Given below are two statements:
Statement $I$: None of the alkaline earth metal hydroxides dissolve in alkali.
Statement $II$: Solubility of alkaline earth metal hydroxides in water increases down the group.
In the light of the above statements,choose the most appropriate answer from the options given below: