Q8 / 69 · JEE Advanced 2008 (Paper 1) · Chemistry

A solution of colourless salt $\mathrm{H}$ on boiling with excess $\mathrm{NaOH}$ produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of $\mathrm{Zn}$ dust to the same solution, the gas evolution restarts. The colourless salt (s) $\mathrm{H}$ is (are)

  • Correct answer
    A
    $\mathrm{NH}_4 \mathrm{NO}_3$
  • Correct answer
    B
    $\mathrm{NH}_4 \mathrm{NO}_2$
  • C
    $\mathrm{NH}_4 \mathrm{Cl}$
  • D
    $\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4$

Solution

$$ \begin{aligned} & \mathrm{NH}_4 \mathrm{NO}_3+\mathrm{NaOH} \longrightarrow \mathrm{NaNO}_3+\mathrm{NH}_3+\mathrm{H}_2 \mathrm{O} \\ & \mathrm{NaNO}_3+8[\mathrm{H}] \mathrm{NaOH}+\mathrm{NH}_3+2 \mathrm{H}_2 \mathrm{O} \\ & \mathrm{NH}_4 \mathrm{NO}_2+\mathrm{NaOH} \longrightarrow \mathrm{NaHO}_2+\mathrm{NH}_3+\mathrm{H}_2 \mathrm{O} \\ & \mathrm{NaNO}_2+6[\mathrm{H}] \longrightarrow \mathrm{NaOH}+\mathrm{NH}_3+\mathrm{H}_2 \mathrm{O} \end{aligned} $$

Hence, the correct answer is options: 'A', 'B'.

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