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p -Block elements - ll — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
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
    $\left(\mathrm{NH}_4\right)_2 \mathrm{Cr}_2 \mathrm{O}_7$
  • ✓
    $\mathrm{Ba}\left(\mathrm{N}_3\right)_2$
✓

Answer

Correct option: D.
$\mathrm{Ba}\left(\mathrm{N}_3\right)_2$
d
Very pure nitrogen can be obtained by the thermal decomposition of sodium or barium azide.

$2 NaN _3 \xrightarrow{573 K} 2 Na +3 N_2$

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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