Oxidation states of $P$ in $H_{4}P_{2}O_{5}, H_{4}P_{2}O_{6}, H_{4}P_{2}O_{7}$ are respectively:

What are the oxidation numbers of $S$ atoms in $S_4O_6^{2-}$?

In the following reaction,assign the oxidation state of the underlined atom for the product of complete hydrolysis at $R.T.$:
$H\underline{N}O_4 + H_2O \longrightarrow HNO_3 + H_2O_2$

Calculate the oxidation number of sulfur,chromium,and nitrogen in $H_2SO_5$,$Cr_2O_7^{2-}$,and $NO_3^-$. Suggest the structures of these compounds and explain the fallacy in the direct calculation of the oxidation number for $H_2SO_5$.

What is the oxidation number of $S$ in $H_2SO_4$?

Oxidation number of oxygen in potassium superoxide $(KO_2)$ is