Which of the alkaline earth metal halides given below is essentially covalent in nature?

Which of the following statements is true regarding alkaline earth metals?

$ZnO$ when heated with $BaO$ at $1100\,^{\circ}C$ gives a compound. Identify the compound.

Which of the following alkaline earth metal hydroxides is the least soluble in water?

Calcium is obtained by which of the following methods?

Heating compound $(A)$ produces a colorless gas and a residue $(B)$ which dissolves in water. Passing excess $CO_2$ gas through the aqueous solution of $(B)$ yields compound $(C)$,which is obtained in solid state. Gently heating compound $(C)$ gives back the white solid $(A)$. What is compound $(A)$?