Oxidation number of potassium in $K_2O$,$K_2O_2$ and $KO_2$,respectively,is

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

An acidic solution of sodium thiosulfate is unstable because in thiosulfate,the two sulfur atoms have different oxidation states of:

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

The oxidation states of sulphur in $S_8$,$S_2F_2$,and $H_2S$ respectively,are:

The oxidation numbers of the two $Cl$ atoms in bleaching powder,$CaOCl_2$,are