What is the oxidation state of nitrogen in the oxide of nitrogen formed by heating ammonium nitrate?

Sulphur has the lowest oxidation number in

The oxidation state of the oxygen atom in potassium superoxide is:

The oxidation state of iodine in $I_3^{-}$ is:

What is the oxidation number of sulfur in $Na_2S_4O_6$?

$1 \ mol$ of compound $N_2H_4$ loses $10 \ mol$ of electrons to form a new compound $Y$. Assuming all nitrogen atoms are present in compound $Y$,what is the oxidation state of $N$ in compound $Y$?