The minimum oxidation state that nitrogen exhibits is

Minimum oxidation state that nitrogen exhibits is $-3$. Nitrogen forms compounds that ranges from $-3$ to $+5$in oxidation state. Ammonia ($N{H}_3$) is one of the example where Nitrogen shows an oxidation state of $-3$. In $N{H_4}^{+}$ Nitrogen shows an oxidation state of $-3$.