Identify the substance acting as oxidant or reductant, reduced if any in the following :

${\mathrm{SO}}_2+2{\mathrm{H}}_2\mathrm{S}⟶3\mathrm{S}+{\mathrm{H}}_2\mathrm{O}$

Identify the substance acting as oxidant and reductant if any in the following:

${\mathrm{BaCl}}_2+{\mathrm{Na}}_2{\mathrm{SO}}_4⟶{\mathrm{BaSO}}_4+2\mathrm{NaCl}$

Identify the substance acting as oxidant or reductant reduced if any in the following reaction:

$3{\mathrm{I}}_2+6\mathrm{NaOH}⟶{\mathrm{NaIO}}_3+5\mathrm{NaI}+3{\mathrm{H}}_2\mathrm{O}$

Determine the oxidation number of following elements given in bold letters ${\mathbf{Fe}}_{0.94}\mathrm{O}$:

Determine the oxidation number of the element which is underlined:

${\mathrm{Na}}_2\left[\underline{\mathrm{Fe}}(\mathrm{CN}{)}_5\mathrm{NO}\right]$

Determine the oxidation number of the element which is underlined.

Dimethyl sulphoxide or ${\left({\mathrm{CH}}_3\right)}_2\underline{\mathrm{S}}\mathrm{O}$.

Determine the oxidation number of the element which is underlined.

$\underline{\mathrm{Cr}}{\mathrm{O}}_5$ or $\underline{\mathrm{Cr}}\mathrm{O}{\left({\mathrm{O}}_2\right)}_2$

Determine the oxidation number of the element which is underlined:

${\mathrm{Ba}}_2\underline{\mathrm{Xe}}{\mathrm{O}}_6$