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

Assertion $(A)$: $Be$ and $Mg$ do not impart any colour to the flame.
Reason $(R)$: The electrons in them are too strongly bound to get excited by the energy of the flame.
The correct option among the following is:

What is obtained when quicklime is heated with coke in an electric furnace?

Which of the following alkaline earth metals shows anomalous behavior and has an electronegativity similar to that of aluminum?

The thermal stability of alkaline earth metal carbonates $MgCO_{3}$,$CaCO_{3}$,$SrCO_{3}$,and $BaCO_{3}$ follows the order:

The increasing order of reactivity of alkaline earth metals with water is