The oxidation numbers of $As$ are

In alkaline condition,$KMnO_4$ reacts as $2KMnO_4 + 2KOH \to 2K_2MnO_4 + H_2O + [O]$. The equivalent weight of $KMnO_4$ would be (Atomic mass of $K = 39$,$Mn = 55$,$O = 16$).

The equivalent weight of $K_{2}Cr_{2}O_{7}$ in acidic medium is expressed in terms of its molecular weight $(M)$ as

In which of the following oxoacids of phosphorus is the oxidation state of phosphorus the minimum?

The oxidation number and covalency of sulphur in the sulphur molecule $S_8$ are respectively

The oxidation number of $Cr$ in $K_3CrO_8$ is $+5$. How many peroxy linkages are present in this molecule?