Oxidation number of Nitrogen in $NH_4NO_3$ is

The equivalent weight of $K_{2}Cr_{2}O_{7}$ in acidic medium is expressed in terms of its molecular weight $(M)$ as

Match the following:

Compound	Oxidation number
$1$. $CrO_5$	$a$. $+6$
$2$. $H_2SO_4$	$b$. $+1$
$3$. $C_4OCl_2$	$c$. $-1$
$4$. $(CH_3)_2SO$	$d$. $+2$

In the reaction of potassium dichromate,potassium chloride and sulfuric acid (conc.),the oxidation state of the chromium in the product is $(+)$ . . . . . . .

Assertion: The average oxidation number of sulfur in $Na_2S_4O_6$ is $2.5$.
Reason: Two $S$ atoms are not directly bonded to $O$-atoms.

What is the oxidation number of $Cl$ in $HOClO_2$?