Small quantities of $NO$ and $HNO_3$ are formed as impurities when $N_2$ is prepared from $NH_4Cl_{(aq)}$ and $NaNO_{2(aq)}$. These impurities can be removed by passing the $N_2$ gas through which of the following?
- A$H_2SO_{4(aq)}$ containing $SO_3$
- B$H_2SO_{4(aq)}$ containing $K_2Cr_2O_7$
- C$H_2SO_{4(aq)}$ containing $KMnO_4$
- D$HCl_{(aq)}$ containing $KMnO_4$
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