From which of the following is the hydration energy of $Mg^{2+}$ larger?

Identify the correct statements from the following.
$(A)$ $BeSO_4$ is soluble in water.
$(B)$ $BeO$ is an amphoteric oxide.
$(C)$ $CO$ can be obtained by heating $CaCO_3$ at $1070-1270 \ K$.

Which of the following is the correct decreasing order of thermal stability of alkaline earth metal carbonates?

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

Which elements are considered as alkaline earth metals? Give a brief description of them.

State True or False:
$(1)$ $90 \ g \ Na$ and $170 \ g \ K$ are present in a person with $70 \ kg$ of body weight.
$(2)$ Ionization enthalpy of alkaline earth metals increases on moving top to bottom.
$(3)$ In vapour phase,$BeCl_2$ possesses a polymer-like arrangement.
$(4)$ $CaCO_3$ is used in the preparation of mortar.