The equivalent weight of ${\mathrm{Cu}}_2\mathrm{S}$ ( molecular weight $=\mathrm{M}$ ) in the following reaction is ${\mathrm{Cu}}_2\mathrm{S}+{\mathrm{MnO}}_4^{-}\to {\mathrm{Cu}}^{2+}+{\mathrm{SO}}_2+{\mathrm{Mn}}^{2+}$

The equivalent mass of ${\mathrm{NO}}_3^{-}$ in the following reaction is

${\mathrm{NO}}_3^{-}\to {\mathrm{NH}}_4^{+}$

Which of the following statement is incorrect for the chemical reaction?
${\mathrm{H}}_2{\mathrm{O}}_2+{\mathrm{O}}_3 \to {\mathrm{H}}_2\mathrm{O}+2{\mathrm{O}}_2$