The oxidation number of carbon in $CH_2Cl_2$ is .........

The equivalent weight of $MnSO_4$ is half its molecular weight when it is converted to

The sum of the oxidation numbers of all atoms in the $S_{2}O_{3}^{2-}$ ion is:

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

What are the oxidation numbers of nitrogen in $NH_4NO_3$?

What are the oxidation states of phosphorus in the following:
$(i)$ $H_{3}PO_{3}$
$(ii)$ $PCl_{3}$
$(iii)$ $Ca_{3}P_{2}$
$(iv)$ $Na_{3}PO_{4}$
$(v)$ $POF_{3}$