Redox Reactions Questions

Consider the following compounds: $\underline{\text{K}}{\text{O}}_2$, ${\text{H}}_2{\underline{\text{O}}}_2$ and ${\text{H}}_2\underline{\text{S}}{\text{O}}_4$. The oxidation states of the underlined elements in them are, respectively:

In the balanced chemical reaction${\text{IO}}_3^{-}+a{\text{I}}^{-}+b{\text{H}}^{+}\to c{\text{H}}_2\text{O}+d{\text{I}}_2$$a,b,c$ and $d$ respectively corresponds to:

The number of moles of ${\text{KMnO}}_4$ that will be needed to react with one mole of sulphite ion in acidic solution is:

Number of moles of ${\text{MnO}}_4^{-}$ required to oxidize one mole of ferrous oxalate completely in acidic medium will be:

Oxidation numbers of $\text{P}$ in ${\text{PO}}_4^{3-}$, of $\text{S}$ in ${\text{SO}}_4^{2-}$ and that of $\text{Cr}$ in ${\text{Cr}}_2{\text{O}}_7^{2-}$, are respectively:

A solution contains ${\text{Fe}}^{2+}$, ${\text{Fe}}^{3+}$ and ${\text{I}}^{-}$ ions. It was treated with iodine at $35^{\circ }\text{C}$. $E^{\circ }$ for ${\text{Fe}}^{3+}/{\text{Fe}}^{2+}=+0.77\text{V}$ and $E^{\circ }$ for ${\text{I}}_2/2{\text{I}}^{-}=0.536\text{V}$. The favourable redox reaction is:

In which of the following compounds, nitrogen exhibits highest oxidation state?

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number?

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified ${\text{KMnO}}_4$ for complete oxidation?