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Heating (NH4)2Cr2O7 releases a gas. The same gas can be produced by:

1. heating NH4NO2
2. heating NH4NO3
3. treating H2O2 with NaNO2
4. treating Mg3N2 with H2O

Correct answer: heating NH4NO2

Solution

(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O, releasing N2; heating NH4NO2 also gives N2 (NH4NO2 -> N2 + 2H2O).

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