Nitric oxide
NO, a colourless gas that, at room temperature, react with oxygen to form nitrogen dioxide (NO₂, a reddish-brown gas); may be used to form other compounds.

Nitride
Compound of nitrogen and a metal, such as Mg₃N₂.

Nitriding
A method of surface hardening steel by treating it in an atmosphere of NH3 which gives a surface layer of nitride. The steel must contain specific alloying elements, e.g., Al, Cr. Mo.

Nitrogen trifluoride
NF₃, a colourless gas with a melting point of -206.60C and a boiling point of – 128.80C; used as an oxidizer for high energy fuels.

Nitrogen dioxide
NO₂, a reddish-brown gas; it exists in varying degrees of concentration in equilibrium with other nitrogen oxides; used to produce nitric acid. Also known as dinitrogen tetroxide; liquid dioxide; nitrogen peroxide; nitrogen tetroxide.

Nitrogen monoxide
A colourless gas obtained by the action of dilute nitric acid on copper turnings. It is used as a reducing agent. It plays important role in ring test of nitrate ion forming FeSOI4NO the brown ring.

Nitrogen trichloride (NCl₃)
Obtained by the action of chlorine or sodium hypochlorite on ammonium chloride. NH₄Cl+3Cl₂NCl₃+4HCl. It is extremely explosive yellow oil. It is hydrolysed by water and rapidly by alkali to give ammonia and oxy acid or oxysalt.