Amongst the following,identify the species with an atom in $+6$ oxidation state.

In which compound is the oxidation state of phosphorus $+4$?

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 $K = 39$,$Mn = 55$,$O = 16$).

Oxygen has an oxidation state of $+2$ in which of the following compounds?

Oxidation state of $S$ in $H_2S_2O_8$ is

$A$ compound of $Xe$ and $F$ is found to have an atomic ratio $Xe : F$ as $0.4 : 2.4$. Find the oxidation number of $Xe$.