What is the oxidation state of chlorine atom in hypochlorous acid?

In the chemical reaction $Cl_2 + H_2S \to 2HCl + S$, the oxidation number of sulphur changes from:

What is the oxidation number of $N$ in $HNO_4$?

In the following reaction,assign the state for the underlined atom in the product of complete hydrolysis at $R.T.$:
$\underline{Cl_2}O + H_2O \longrightarrow 2HClO$

The correct order of $N$ compounds in their decreasing order of oxidation states is:

What is the oxidation state of $Cl$ in $KClO_3$?