The oxidation number of $C$ in $CO_2$ is

What are the oxidation states of three $Br$ atoms in $Br_3O_8$ molecule?

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

In the following reaction,assign the state for the underlined atom for the product of complete hydrolysis at $R.T.$:
$\underline{Cl}F + H_2O \longrightarrow HOCl + HF$

What are the respective oxidation states of sulphur atoms numbered $1$ to $4$ in the tetrathionate ion $(S_4O_6^{2-})$ shown below?

In which among the following compounds,the oxidation number of nitrogen is $ +5 $?