Paragraph: Upon heating $\mathrm{KClO}_{3}$ in the presence of catalytic amount of $\mathrm{MnO}_{2}$, a gas…
Paragraph:
Upon heating $\mathrm{KClO}_{3}$ in the presence of catalytic amount of $\mathrm{MnO}_{2}$, a gas $\mathbf{W}$ is formed. Excess amount of $\mathbf{W}$ reacts with white phosphorus to give $\mathbf{X}$. The reaction of $\mathbf{X}$ with pure $\mathrm{HNO}_{3}$ gives $\mathbf{Y}$ and $\mathbf{Z}$.
Question:
$\mathbf{W}$ and $\mathbf{X}$ are, respectively