Which of the following is different from the other three oxides?

On heating,which of the following releases $CO_2$ most easily?

Which of the following elements has the highest tendency to form a peroxide?

$CaCO_3$ $\xrightarrow[excess \ H_2O]{in \ CO_2} A$ $\xrightarrow{\Delta} B$
Identify $A$ and $B$.

$X + C + Cl_2 \xrightarrow{1000 \ K} Y + CO;$
$Y + 2H_2O \rightarrow Z + 2HCl$
Compound $Y$ is found in a polymeric chain structure and is an electron-deficient molecule. $Y$ must be:

Match Column $(A)$ with the appropriate options in Column $(B)$.

Column $(A)$	Column $(B)$
$(a)$ $BeO$	$(p)$ Amphoteric
$(b)$ $MgCO_3 \cdot CaCO_3$	$(q)$ Dolomite
$(c)$ $BeCl_2$	$(r)$ Covalent
$(d)$ $Al(OH)_3$	$(s)$ Basic