Question

Heating of ammonium dichromate yield a gas, which is also obtained by

• A. Reaction of Mg3N2 in H2O
• B. Heating NH4NO3
• C. Heating NH4NO2
• D. Na2O2 in H2O

Answer 1

Answer: (C)

Heating NH4NO2

Answer 2

The gas produced by heating ammonium dichromate is Nitrogen ($N_2$).

• A. Reaction of $Mg_3N_2$ in $H_2O$: Produces $NH_3$, not $N_2$. $Mg_3N_2(s) + 6H_2O(l) \to 3Mg(OH)_2(s) + 2NH_3(g)$

• B. Heating $NH_4NO_3$: Produces $N_2O$, not $N_2$. $NH_4NO_3(s) \xrightarrow{\text{heat}} N_2O(g) + 2H_2O(g)$

• C. Heating $NH_4NO_2$: Produces $N_2$, which matches the gas obtained from heating ammonium dichromate. $NH_4NO_2(s) \xrightarrow{\text{heat}} N_2(g) + 2H_2O(g)$

• D. $Na_2O_2$ in $H_2O$: Produces $O_2$, not $N_2$. $2Na_2O_2(s) + 2H_2O(l) \to 4NaOH(aq) + O_2(g)$

Therefore, heating ammonium nitrite yields the same gas ($N_2$) as heating ammonium dichromate.