The heating of $NH _4 NO _2$ at $60-70^{\circ} C$ and $NH _4 NO _3$ at $200-250^{\circ} C$ is associated with the formation of nitrogen containing compounds $X$ and $Y$, respectively. $X$ and $Y$, respectively, are
- A$N _2$ and $N _2 O$
- B$NH _3$ and $NO _2$
- C$NO$ and $N _2 O$
- D$N _2$ and $NH _3$
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