Q29 / 160 · AP EAMCET 2022 (08 Jul Shift 1) · Chemistry

Small quantities of $\mathrm{NO}$ and $\mathrm{HNO}_3$ are formed as impurities, when $\mathrm{N}_2$ is prepared from $\mathrm{NH}_4 \mathrm{Cl}$ (aq) and $\mathrm{NaNO}_2$ (aq), these impurities can be removed by passing the $\mathrm{N}_2$ gas through which of the following?

  • A
    $\mathrm{H}_2 \mathrm{SO}_4(\mathrm{aq})$ containing $\mathrm{SO}_3$
  • Correct answer
    B
    $\mathrm{H}_2 \mathrm{SO}_4(\mathrm{aq})$ containing $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
  • C
    $\mathrm{H}_2 \mathrm{SO}_4(\mathrm{aq})$ containing $\mathrm{KMnO}_4$
  • D
    $\mathrm{HCl}(\mathrm{aq})$ containing $\mathrm{KMnO}_4$

Solution

$\mathrm{NH}_4 \mathrm{Cl}(\mathrm{aq})+\mathrm{NaNO}_2(\mathrm{aq}) \rightarrow \mathrm{N}_2 \uparrow+2 \mathrm{H}_2 \mathrm{O}+\mathrm{NaCl}$ The impurities of $\mathrm{NO}$ and $\mathrm{HNO}_3$ in the $\mathrm{N}_2$ gas can be removed by passing the gas through an aqueous $\mathrm{H}_2 \mathrm{SO}_4$ solution containing $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$.

Hence, the correct answer is option: 'B'.

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