In $NH_4NO_2$,the oxidation number of nitrogen will be

The oxidation number of sulphur is $-4$ in

Calculate the oxidation number of sulphur,chromium,and nitrogen in $H_2SO_5$,$Cr_2O_7^{2-}$,and $NO_3^-$. Suggest the structures of these compounds and explain the fallacy in the calculated oxidation number for $H_2SO_5$.

$A$ compound contains atoms of $x, y$ and $z$ elements. Oxidation numbers of $x, y$ and $z$ are $+3, +5$ and $-2$ respectively. Identify the possible formula of this compound?

Match the following compounds with their respective oxidation numbers of the central atom or specific element:

Compound	Oxidation number
$1$. $C_2H_6$	$a$. $+3$
$2$. $H_2O_2$	$b$. $+6$
$3$. $LiAlH_4$	$c$. $-3$
$4$. $HO_2^-$	$d$. $-1$
$5$. $PbSO_4$	$e$. $+1$

Sulphur has the highest oxidation state in