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  4. Extra pure N2 can be obtained by heating

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Q. Extra pure $N_2$ can be obtained by heating

IIT JEEIIT JEE 2011The p-Block Elements - Part2

Solution:

$Ba(N_3)_2 \xrightarrow{\text{Heat}} Ba(s) + 3N_2 (g )$
Azide salt of barium can be obtained in purest form as well as the decomposition product contain solid $Ba$ as by product along with gaseous nitrogen, hence no additional step of separation is required.
Other reactions are
$NH_4 NO_3 \xrightarrow{\text{Heat}} N_2 O+2H_2 O$
$2NH_3+3CuO \xrightarrow{\text{Heat}} 3Cu+3H_2O+N_2$
$(NH_4)_2 Cr_2 O_7 \xrightarrow{\text{Heat}} Cr_2 O_3+4H_2 O+N_2$