What is the oxidation state of $Cl$ in $KClO_3$?

What is the oxidation state of $Fe$ in $Fe_3O_4$?

In how many of the following compounds of sulphur,the oxidation state of sulphur atom is $+6$?
$H_2S_2O_8, H_2SO_5, H_2SO_3, H_2SO_4, H_2S_2O_7, SO_2Cl_2, SOCl_2$

The oxidation state of sulfur in the anions $SO_3^{2-}$,$S_2O_4^{2-}$,and $S_2O_6^{2-}$ increases in the order:

The correct order of the oxidation states of nitrogen in $NO$,$N_2O$,$NO_2$,and $N_2O_3$ is:

Write the oxidation number of the carbon atom in the carboxyl group of acetic acid $(CH_3COOH)$.