$$\begin{gathered} \mathrm{А}) {\mathrm{KNO}}_2 + {\mathrm{KMnO}}_4 + {\mathrm{H}}_2{\mathrm{SO}}_4\to \\ \mathrm{Б}) {\mathrm{KMnO}}_4 \stackrel{\mathrm{t} }{\to } \\ \mathrm{В}) {\mathrm{KNO}}_2 + {\mathrm{KMnO}}_4 + {\mathrm{H}}_2\mathrm{O}\to \\ \mathrm{Г}) {\mathrm{KNO}}_2 + {\mathrm{KMnO}}_4 + \mathrm{KOH}\to \end{gathered}$$

$$\begin{gathered} 1) {\mathrm{K}}_2{\mathrm{MnO}}_4 + {\mathrm{MnO}}_2 + {\mathrm{O}}_2 \uparrow \\ 2) {\mathrm{KNO}}_3 + {\mathrm{K}}_2{\mathrm{SO}}_4 + {\mathrm{MnSO}}_4 + {\mathrm{H}}_2\mathrm{O} \\ 3) {\mathrm{KNO}}_3 + {\mathrm{K}}_2{\mathrm{MnO}}_4 + {\mathrm{H}}_2\mathrm{O} \\ 4) {\mathrm{KNO}}_3 + {\mathrm{MnO}}_2 + \mathrm{KOH} \end{gathered}$$