Thermal stability of $BaCO_3, CaCO_3, SrCO_3$ and $MgCO_3$ decreases in the order of :

$A$ chloride is significantly soluble in cold water. When placed on a $Pt$ wire and heated in a Bunsen flame,it does not impart any characteristic color to the flame. Which of the following cations is present?

Which of the following salts increases the rate of the setting process of Plaster of Paris?

Give a brief explanation of the ionisation enthalpy of alkaline earth metals (Group-$2$) elements.

Which one of the following compounds is a peroxide?

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: