Among the alkaline earth metals,the element forming predominantly covalent compounds is:

The correct order of solubility of sulfates of $Be$ group elements in water is $Be > Mg > Ca > Sr > Ba$. The reason for this is ....

Which of the following compounds does not show amphoteric behaviour?

Which of the following is not a characteristic of barium $(Ba)$?

Match column-$I$ with column-$II$ :

Column-$I$	Column-$II$
$(a)$ Calcium	$(p)$ Crimson red
$(b)$ Barium	$(q)$ Brick red
$(c)$ Strontium	$(r)$ Apple green
-	$(s)$ Yellow

When water is added to compound $(A)$ of calcium,a solution of compound $(B)$ is formed. When carbon dioxide is passed into the solution,it turns milky due to the formation of compound $(C)$. If excess of carbon dioxide is passed into the solution,the milkiness disappears due to the formation of compound $(D)$. Identify the compounds $A$,$B$,$C$,and $D$. Explain why the milkiness disappears in the last step.