In which compound is the oxidation state of nitrogen $+1$?

Assign the oxidation number to the underlined element in each of the following species:
$1$. $NaH_{2}\underline{P}O_{4}$
$2$. $NaH\underline{S}O_{4}$
$3$. $H_{4}\underline{P_{2}}O_{7}$

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

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

Oxidation number of $N$ in ammonium nitrate is

The oxidation state of $Cr$ in $CrO_5$ is

Oxidation number of $Mn$ in $K_2MnO_4$ and $MnSO_4$ are respectively