Assign oxidation numbers to atoms of only those elements which undergo an oxidation change in the following redox reactions and then balance the equations.

${\mathrm{As}}_2{\mathrm{S}}_5+{\mathrm{HNO}}_3 \to {\mathrm{H}}_3{\mathrm{AsO}}_4+{\mathrm{H}}_2{\mathrm{SO}}_4+{\mathrm{NO}}_2+{\mathrm{H}}_2\mathrm{O}$

Assign oxidation number to atoms of only those elements which undergo oxidation number change in the following redox reaction and then balance the equation.

$\mathrm{PbS}+{\mathrm{O}}_3\to {\mathrm{PbSO}}_4+{\mathrm{O}}_2$

Assign oxidation number to atoms of only those elements which undergo oxidation number change in the following redox reaction and then balance the equation.

${\mathrm{Cl}}_2+{\mathrm{SeO}}_3^{2-}+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{SeO}}_4^{2-}+{\mathrm{Cl}}^{-}+{\mathrm{H}}^{+}$

Assign oxidation number to atoms of only those elements which undergo oxidation number change in the following redox reaction and then balance the equation.

${\mathrm{Cu}}_3\mathrm{P}+{\mathrm{H}}^{+}+{\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}\to {\mathrm{Cu}}^{2+}+{\mathrm{H}}_3{\mathrm{PO}}_4+{\mathrm{Cr}}^{3+}+{\mathrm{H}}_2\mathrm{O}$

Assign oxidation number to atoms of only those elements which undergo oxidation number change in the following redox reaction and then balance the equation.

${\mathrm{Na}}_2{\mathrm{SnO}}_2+\mathrm{Bi}(\mathrm{OH}{)}_3\to \mathrm{Bi}+{\mathrm{Na}}_2{\mathrm{SnO}}_3+{\mathrm{H}}_2\mathrm{O}$

Assign  oxidation number to atoms of only those elements which undergo oxidation number change in the following redox reaction and then balance the equation.

${\mathrm{H}}_2\mathrm{O}+{\mathrm{SbCl}}_3\to \mathrm{SbOCl}+ \mathrm{HCl}$

Assign oxidation number to atoms of only those elements which undergo oxidation number change in the following redox reaction and then balance the equation.

${\mathrm{K}}_4\mathrm{Fe}(\mathrm{CN}{)}_6+\mathrm{Ce}{\left({\mathrm{NO}}_3\right)}_4+\mathrm{KOH}\to \mathrm{Ce}(\mathrm{OH}{)}_3+\mathrm{Fe}(\mathrm{OH}{)}_3+{\mathrm{H}}_2\mathrm{O}+{\mathrm{K}}_2{\mathrm{CO}}_3+{\mathrm{KNO}}_3$

Assign oxidation number to atoms of only those elements which undergo oxidation number change in the following redox reaction and then balance the equation.

$\mathrm{S}+{\mathrm{OH}}^{-}\to {\mathrm{S}}^{2-}+{\mathrm{S}}_2{\mathrm{O}}_3^{2-}+{\mathrm{H}}_2\mathrm{O}$

Assign $\mathrm{O}.\mathrm{N}.$ (oxidation number) to atoms of only those elements which undergo $\mathrm{O}.\mathrm{N}.$ change in the following redox reaction and then balance the equation.

${\mathrm{IO}}_4^{-}+{\mathrm{I}}^{-}+{\mathrm{H}}^{+}\to {\mathrm{I}}_2+{\mathrm{H}}_2\mathrm{O}$