Oxidation number of $N$ in $HNO_3$ is

What is the oxidation state of $Fe$ in $Fe_{0.94}O$?

In which of the following substances is the oxidation state of sulfur $-1$?

The oxidation number of $S$ in Caro's acid is ..........

What is the oxidation number of $As$ in $H_{3}AsO_{3}$?

$A$ compound contains $x$,$y$,and $z$ atoms. The oxidation number of $x$ is $+3$,$y$ is $-5$,and $z$ is $+1$. The possible formula of the compound is: