Give the chemical reaction that shows the hydrolysis of peroxides alkali metal with cold water.

In the following reaction, the total number of oxygen atoms in $X$ and $Y$ is______ 

${\mathrm{Na}}_2\mathrm{O}+{\mathrm{H}}_2\mathrm{O}\to 2\mathrm{X}$

${\mathrm{Cl}}_2{\mathrm{O}}_7+{\mathrm{H}}_2\mathrm{O}\to 2\mathrm{Y}$

Identify $\mathrm{A}$ and $\mathrm{B}$ from the following reaction

 ${\mathrm{NaNO}}_3\stackrel{∆}{⟶}\mathrm{xA}+\mathrm{yB}$

$\text{A}\stackrel{\mathrm{\Delta }}{\to }\mathrm{B}+\mathrm{C}\uparrow$

Both $\mathrm{A}$ and $\mathrm{B}$ releases same gas $\mathrm{D}$ and forms ${\mathrm{Na}}_2{\mathrm{ZnO}}_2$, when they are treated with zinc metal in the presence sodium hydroxide.
 Identify the incorrect statement for the above reactions.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$