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

• Correct answer
  A

  $\mathrm{N}_2$ and $\mathrm{N}_2 \mathrm{O}$
• B

  $\mathrm{NH}_3$ and $\mathrm{NO}_2$
• C

  NO and $\mathrm{N}_2 \mathrm{O}$
• D

  $\mathrm{N}_2$ and $\mathrm{NH}_3$

Hence, the correct answer is option: 'A'.