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On heating, which of the following substances liberates ammonia gas?

1. Ba(N3)2 Δ → Ba + 3N2
2. (NH4)2Cr2O7 Δ → Cr2O3 + N2 + 4H2O
3. NH4NO2 Δ → N2 + 2H2O
4. (NH4)2SO4 Δ → 2NH3 + H2SO4

Correct answer: (NH4)2SO4 Δ → 2NH3 + H2SO4

Solution

(NH4)2SO4 decomposes upon heating to produce ammonia gas and sulfuric acid, making it the only option that directly liberates ammonia.

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