In the following reactions,the total number of oxygen atoms in $X$ and $Y$ is $........$.
$Na_2O + H_2O \rightarrow 2 X$
$Cl_2O_7 + H_2O \rightarrow 2 Y$
$Na_2O + H_2O \rightarrow 2 X$
$Cl_2O_7 + H_2O \rightarrow 2 Y$
- A$4$
- B$5$
- C$3$
- D$2$
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