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Extra pure N2 can be obtained by heating

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a

NH3 with CuO

b

NH4NO3

c

(NH4)2 Cr2O7

d

Ba(N3)2

answer is D.

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Detailed Solution

BaN32→HeatBa(s)+3N2(g)Azide salt of barium can be obtained in purest form as well as the decomposed product contain solid Ba as by-product along with gaseous nitrogen, hence no additional step ofseparation is required. Other reactions areNH4NO3→HeatN2O+2H2O2NH3+3CuO→Heat3Cu+3H2O+N2NH42Cr2O7→HeatCr2O3+4H2O+N2

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