At room temperature, disproportionation of an aqueous solution of in situ generated nitrous acid \( \mathrm{(HNO_2)} \) gives the species
\( \mathrm{H_3O^+} \), \( \mathrm{NO_3^-} \) and \( \mathrm{NO} \)
\( \mathrm{H_3O^+} \), \( \mathrm{NO_3^-} \) and \( \mathrm{NO_2} \)
\( \mathrm{H_3O^+} \), \( \mathrm{NO^-} \) and \( \mathrm{NO_2} \)
\( \mathrm{H_3O^+} \), \( \mathrm{NO_3^-} \) and \( \mathrm{N_2O} \)
