Question

If true enter 1, else enter 0.
${NO}_2^{-}$ interferes in the 'ring test' of ${NO}_3^{-}$. A chemical method of removal of ${NO}_2^{-}$ is boiling the mixture with $N{H}_{4}Cl$.

${NO}_2^{-}$ is decomposed as follows:

$NaN{O}_2+N{H}_{4}Cl\stackrel{△}{⟶}NaCl+N_2\uparrow +2H_{2}O$

Answer 1

${N{O}_2}^{-}$ interferes in the ring test of ${N{O}_3}^{-}$.

To remove ${NO}_2^{-}$ from the solution, it is boiled with ammonium chloride solution.
${NO}_2^{-}$ decomposes to nitrogen. The reaction is as follows:
$NaN{O}_2+N{H}_{4}Cl\stackrel{△}{⟶}NaCl+N_2\uparrow +2H_{2}O$