Dichromate ion is treated with base,the oxidation number of $Cr$ in the product formed is .... .

$KMnO_4$ acts as an oxidising agent in the neutral medium and gets reduced to $MnO_2$. What is the equivalent weight of $KMnO_4$ in a neutral medium?

The correct set of oxidation numbers of $Br$ in $Br_3O_8$ is

The oxidation state of phosphorus in hypophosphoric acid is $+......$

The oxidation number of sulphur in $S_2O_3^{2-}$ is:

In which of the following compounds,an element exhibits two different oxidation states?