Calculate the oxidation number of underlined atoms.

${\mathrm{H}}_2\underline{\mathrm{S}}{\mathrm{O}}_4$

Calculate the oxidation number of underlined atoms.

Calculate the oxidation number of underlined atoms.

Calculate the oxidation number of underlined atom.

Calculate the oxidation number of underlined atoms.

Calculate the oxidation number of underlined atom.

Calculate the oxidation number of underlined atom.

Justify that the following reaction is redox reaction; identify the species oxidized/reduced, Which acts as an oxidant and which acts as a reductant?

$2{\mathrm{Cu}}_2\mathrm{O}\left(\mathrm{s}\right) +{\mathrm{Cu}}_2\mathrm{S}\left(\mathrm{s}\right)\to 6\mathrm{Cu}\left(\mathrm{s}\right) + {\mathrm{SO}}_2\left(\mathrm{g}\right)$

Justify that the following reactions are redox reaction; identify the species oxidised/reduced, Which acts as an oxidant and which act as a reductant.