The equivalent weight of ${\mathrm{H}}_2{\mathrm{SO}}_4$, in the following reaction is

${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+3{\mathrm{SO}}_2+{\mathrm{H}}_2{\mathrm{SO}}_4\to 3{\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{Cr}}_2{\left({\mathrm{SO}}_4\right)}_3+{\mathrm{H}}_2\mathrm{O}$

The equivalent weight of ${\mathrm{HNO}}_3$(molecular weight = 63) in the following reaction is

$3\mathrm{Cu}+8{\mathrm{HNO}}_3\to 3\mathrm{Cu}{\left({\mathrm{NO}}_3\right)}_2+2\mathrm{NO}+4{\mathrm{H}}_2\mathrm{O}$

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?
${\mathrm{H}}_2{\mathrm{O}}_2+{\mathrm{O}}_3 \to {\mathrm{H}}_2\mathrm{O}+2{\mathrm{O}}_2$