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Question

(B) The thermal decomposition of ammonium nitrite $(NH_4NO_2)$ yields pure $N_2$ gas.$NH_4Cl_{(aq)} + NaNO_{2(aq)} 	o NH_4NO_{2(aq)} + NaCl_{(aq)}$$N

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$NH_4Cl + NaNO_2$

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(B) The thermal decomposition of ammonium nitrite $(NH_4NO_2)$ yields pure $N_2$ gas.$NH_4Cl_{(aq)} + NaNO_{2(aq)} 	o NH_4NO_{2(aq)} + NaCl_{(aq)}$$NH_4NO_{2(aq)} \xrightarrow{\Delta} N_{2(g)} + 2H_2O_{(l)}$Note: While $(NH_4)_2Cr_2O_7$ also produces $N_2$,the reaction with $NH_4Cl$ and $NaNO_2$ is the standard laboratory method for preparing pure $N_2$.

Pure $N_2$ gas is obtained from

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