Heating $(NH_4)_2Cr_2O_7$ produces a gas. This gas can also be obtained by:
- AHeating $NH_4NO_2$
- BHeating $NH_4NO_3$
- CReaction of $NaNO_2$ with $H_2O_2$
- DReaction of $Mg_3N_2$ with $H_2O$
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