$BaSO_4$ and carbon on heating react to produce:

$MgCl_2 \cdot 6H_2O$ when heated gives:

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.

$s-$block element which cannot be qualitatively confirmed by the flame test is ..... .

Give a detailed explanation of the oxoacid salts of alkaline earth metal elements.

What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?