Redox Reactions question bank (Chemistry)

In the reaction, $\mathrm{M}\mathrm{n}{\mathrm{O}}_{4\mathrm{}\left(\mathrm{a}\mathrm{q}.\right)}^{-1}+\mathrm{B}{\mathrm{r}}_{\left(\mathrm{a}\mathrm{q}.\right)}^{-1}\to \mathrm{M}\mathrm{n}{\mathrm{O}}_{2\left(\mathrm{s}\right)}+\mathrm{B}\mathrm{r}{\mathrm{O}}_{3\mathrm{}\left(\mathrm{a}\mathrm{q}\right)}^{-1},$ the correct change in oxidation number of the species involved is

How many gram-equivalents of $\mathrm{NaOH}$ are required to neutralise $25 \mathrm{~cm}^{3}$ of a decinormal $\mathrm{HCl}$ solution?