Chemistry - Redox Reactions Question with Solution | TestHub

When a mixture of potassium chlorate, oxalic acid and sulphuric acid is heated, the following reaction occurs : $\stackrel{+5}{{\mathrm{KClO}}_3}+{\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4+\stackrel{+6}{{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4}\to \stackrel{+6}{{\mathrm{K}}_2\mathrm{S}{\mathrm{O}}_4}+\stackrel{-1}{\mathrm{KCl}}+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$ i.e. maximum change in oxidation number is observed in $\mathrm{Cl}(+5$ to-1). Thus, $\mathrm{Cl}$ is the element which undergoes maximum change in the oxidation state.