$100 \mathrm{mL}$ of $0.1 \mathrm{M} {\mathrm{NaHC}}_2{\mathrm{O}}_4$ is neutralised by $\mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}$ and ${\mathrm{V}}_2 \mathrm{mL}$ of a $\mathrm{M} {\mathrm{KMnO}}_4$separately, then for complete neutralisation:

In the titration of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_2$ and ferrous sulphate, following data is obtained: 

${\mathrm{V}}_1 \mathrm{mL}$ of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_2$ solution of molarity ${\mathrm{M}}_1$ requires ${\mathrm{V}}_2 \mathrm{mL}$ of ${\mathrm{FeSO}}_4$ solution of molarity ${\mathrm{M}}_2$.

Which of the following relations is/are true for the above titration? 

Calculate the equivalent mass of each oxidant and reductant in:

${\mathrm{FeSO}}_4+{\mathrm{KClO}}_3⟶\mathrm{KCl}+{\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3$

Calculate the equivalent mass of each oxidant and reductant in:

${\mathrm{Na}}_2{\mathrm{SO}}_3+{\mathrm{Na}}_2{\mathrm{CrO}}_4⟶{\mathrm{Na}}_2{\mathrm{SO}}_4+\mathrm{Cr}(\mathrm{OH}{)}_3$

Calculate the equivalent mass of each oxidant and reductant in:

${\mathrm{Fe}}_3{\mathrm{O}}_4+{\mathrm{KMnO}}_4⟶{\mathrm{Fe}}_2{\mathrm{O}}_3+{\mathrm{MnO}}_2$