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1)

Extra pure N2 can be obtained by heating


A) NH3 with CuO

B) NH4NO4

C) (NH4)2Cr2O7

D) Ba(N3)2

Answer:

Option D

Explanation:

 Ba(N3)2heatBa(s)+3N2(g)

Azide salt of barium can be obtained in purest form as well as the decomposition product contain solid Ba as byproduct along with gaseous nitrogen, hence no additional step of separation is required. Other reactions are

  NH4NO3heatN2O+2H2O

2NH3+3CuOheat3Cu+3H2O+N2

  (NH4)2Cr2O7heatCr2O3+4H2O+N2