MCQ
Extra pure $\mathrm{N}_2$ can be oblained by heating
- A$\mathrm{NH}_3$ with $\mathrm{CuO}$
- B$\mathrm{NH}_4 \mathrm{NO}_3$
- C$\left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7$
- ✓$\mathrm{Ba}\left(\mathrm{N}_3\right)_2$
$2 NaN _3 \xrightarrow{573 K} 2 Na +3 N_2$
Azide salt of barium can be obtained in the purest form as well as the decomposition product contains solid Ba as a by-product along with gaseous nitrogen, hence no additional step of separation is required.
$Ba \left( N _3\right)_2 \xrightarrow{\text { heat }} Ba +3 N_2$
Hence, option $D$ is correct.
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${N_{2(g)}} + 3{H_{2(g)}} \rightleftharpoons \,2N{H_{3(g)}}$ at equilibrium at constant volume will lead to
$(I)\,[Xe]\, 6s^1$ $(II)\,[Xe]\,4f^{14}\,5d^1\,6s^2$
$(III)\,[Ar]\,4s^2\,4p^5$ $(IV)\,[Ar]\,3d^7,\,4s^2$
Select the incorrect statement about these elements