The oxidation state of $Mn$ in $K_2MnO_4$ is:

What is the oxidation state of $S$ in the sulphur-containing product of the following reaction?
$SO_3^{2-}{_{\text{(aq)}}} + Br_{2\text{(l)}} + H_2O_{\text{(l)}} \rightarrow $

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

The oxidation number of iodine varies from:

Calculate the oxidation number of $Cr$ in $CrO_4^{2-}$ ion and $K_2Cr_2O_7$ respectively.

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