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(B) When an aqueous solution of ammonium chloride $(NH_4Cl)$ is treated with sodium nitrite $(NaNO_2)$,ammonium nitrite $(NH_4NO_2)$ is formed as an i

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$N_2$

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(B) When an aqueous solution of ammonium chloride $(NH_4Cl)$ is treated with sodium nitrite $(NaNO_2)$,ammonium nitrite $(NH_4NO_2)$ is formed as an intermediate.$NH_4Cl(aq) + NaNO_2(aq) \rightarrow NH_4NO_2(aq) + NaCl(aq)$Ammonium nitrite is unstable and decomposes upon heating to produce nitrogen gas $(N_2)$ and water $(H_2O)$.$NH_4NO_2(aq) \rightarrow N_2(g) + 2H_2O(l)$Thus,the gas produced is $N_2$.

The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is .... .

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