Which of the following compounds liberate $\mathrm{N}_{2}$ on heating?

Which of the following compounds liberate $\mathrm{N}_{2}$ on heating?
  1. $\left(\mathrm{NH}_{4}ight)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$
  2. $\mathrm{Cu}\left(\mathrm{NO}_{3}ight)_{2}$
  3. $\mathrm{AgNO}_{3}$
  4. $\mathrm{NH}_{4} \mathrm{NO}_{3}$

Solution

$\left(\mathrm{NH}_{4}ight)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ liberates $N_{2}$ on heating
$\left(\mathrm{NH}_{4}ight)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \stackrel{\Delta}{\longrightarrow} N_{2} \uparrow +\mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{H}_{2} \mathrm{O}$

Asked in: JEE-TOPICTESTS-CHEMISTRY

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