Which one contains both $Ca$ and $Mg$?

Portland cement is manufactured by using:

State whether the following statements are True or False:
$(1)$ Plaster of Paris is used to join fractured bones and keep them immobilized.
$(2)$ Calcium carbonate and soil are the raw materials for cement production.

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

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

The most electropositive amongst the alkaline earth metals is