Identify the alkaline earth metal from the following.

Which of the following alkaline earth metals is the most electropositive?

Which salt is used as a purgative?

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

Which of the following chlorides is covalent and soluble in ether?

Fill in the blanks:
$(1)$ Calcium and beryllium have flame colors of ...... and ....... respectively.
$(2)$ Quantitative analysis of calcium is carried out by ........
$(3)$ Beryllium powder on combustion burns brightly in air and gives ...... and .......
$(4)$ Beryllium hydroxide on dissolving in alkali gives .......