Write the oxidation state of manganese in the following compounds.

${\mathrm{MnSO}}_4,{\mathrm{Mn}}_2{\mathrm{O}}_3,{\mathrm{MnCl}}_2,{\mathrm{HMnO}}_4,{\mathrm{H}}_2{\mathrm{MnO}}_4$

Write the oxidation number of the underlined elements in the following given compound/ions.
(i) ${\mathrm{H}}_3\underline{\mathrm{P}}{\mathrm{O}}_4$
(ii) ${\mathrm{H}}_2\underline{{\mathrm{C}}_2}{\mathrm{O}}_4$
(iii) ${\mathrm{H}}_2\underline{{\mathrm{N}}_2}{\mathrm{O}}_2$
(iv) ${\mathrm{H}}_2\underline{\mathrm{S}}$
(v) ${\mathrm{H}}_2\underline{\mathrm{S}}{\mathrm{O}}_3$
(vi) ${\underset{¯}{\mathrm{Fe}}}_3{\mathrm{O}}_4$
(vii) ${\mathrm{Na}}_2\underline{\mathrm{O}}$
(viii) ${\underset{¯}{\mathrm{OF}}}_2$
(ix) ${\mathrm{K}}_2\underline{{\mathrm{Cr}}_2}{\mathrm{O}}_7$

(x) ${\mathrm{H}}_2\underline{\mathrm{Xe}}{\mathrm{O}}_4$

(xi) ${\mathrm{H}}_4{\mathrm{XeO}}_6$

(xii) ${\underset{¯}{\mathrm{Al}}}_2{\left({\mathrm{SO}}_4\right)}_3$