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The compound that does not produce nitrogen gas by the thermal decomposition is:

1. Ba(N3)2
2. (NH4)2Cr2O7
3. NH4NO2
4. (NH4)2SO4

Correct answer: (NH4)2SO4

Solution

Ba(N3)2 -> Ba + 3N2, (NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O, and NH4NO2 -> N2 + 2H2O all release N2. (NH4)2SO4 on heating gives NH3 and H2SO4 (and NH4HSO4), never N2, so it is the compound that does not produce nitrogen gas.

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