What is the oxidation number of $P$ in $KH_2PO_2$?

When $KMnO_4$ acts as an oxidising agent and ultimately forms $[MnO_4]^{2-}$,$MnO_2$,$Mn_2O_3$,and $Mn^{2+}$,the number of electrons transferred in each case respectively is:

What are the oxidation states of $S$ in $S_8$,$H_2S$,and $S_2F_2$ respectively?

What is the oxidation number of sulfur in $Na_2S_4O_6$?

The oxidation state of the oxygen atom in potassium superoxide is:

The oxidation state of sulphur in $SO_4^{2-}$ is