pBlock ElementsII - Result Question 18

####18. Extra pure N2 can be obtained by heating

(a) NH3 with CuO

(b) NH4NO3

(c) (NH4)2Cr2O7

(d) Ba(N3)2

(2011)

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Solution:

  1. Ba(N3)2 Heat Ba(s)+3N2(g)

Azide salt of barium can be obtained in purest form as well as the decomposition product contain solid Ba as by product alongwith gaseous nitrogen, hence no additional step of separation is required.

Other reactions are

NH4NO3 Heat N2O+2H2O 2NH3+3CuO Heat 3Cu+3H2O+N2 (NH4)2Cr2O7 Heat Cr2O3+4H2O+N2



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