$3MnO_4^{2-} + 2H_2O \rightleftharpoons 2MnO_4^- + MnO_2 + 4OH^-$
\(\mathrm{MnO}_{4}^{-}\) does not oxidizes \(\mathrm{H}_{2} \mathrm{CO}_{3}\) (maximum oxidation state of \(\mathrm{C}\) )
$2S{O_2} + {O_2}$ $\rightleftharpoons$ $2S{O_3} + Q$ $Cal$
$NO_{(g)} + \frac{1}{2}{O_2} \rightleftharpoons N{O_2}_{(g)}$
$2N{O_2}_{(g)} \rightleftharpoons 2NO_{(g)} + {O_2}_{(g)}$