What is the oxidation number of nitrogen in $N_3H$?

The oxidation number of the underlined atom in the following species is given. Identify the incorrect option.

State whether the following statements are True or False:
$(1)$ The oxidation number of nitrogen in ammonium chloride $(NH_4Cl)$ is $(-3)$.
$(2)$ The oxidation number of $C$ in methyl chloride $(CH_3Cl)$ is $(-2)$.
$(3)$ In the following reaction,the oxidation number of $Br$ changes from $0$ to $+5$: $Br_2 \to BrO_3^-$.

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

In $Na_2S_4O_6$,the oxidation number of $S$ is

The correct order of the oxidation states of nitrogen in $NO$,$N_2O$,$NO_2$,and $N_2O_3$ is: