Nitrogen oxide may refer to a binary compound of oxygen and nitrogen, or a mixture of such compounds: Nitric oxide (NO), nitrogen(II) oxide, or nitrogen monoxide Nitrogen dioxide (), nitrogen(IV) oxide Nitrogen trioxide (), or nitrate radical Nitrous oxide (), nitrogen(0,II) oxide Dinitrogen dioxide (), nitrogen(II) oxide dimer Dinitrogen trioxide (), nitrogen(II,IV) oxide Dinitrogen tetroxide (), nitrogen(IV) oxide dimer Dinitrogen pentoxide (), nitrogen(V) oxide, or nitronium nitrate Nitrosyl azide (), nitrogen(−I,0,I,II) oxide Nitryl azide () Oxatetrazole () Trinitramide ( or ), nitrogen(0,IV) oxide Nitrosonium ( or ) Nitronium ( or ) In atmospheric chemistry: (or NOx) refers to the sum of NO and . (or NOy) refers to the sum of and all oxidized atmospheric odd-nitrogen species (e.g. the sum of , , , etc.) (or NOz) = − Mixed Oxides of Nitrogen ("MON"): solutions of nitric oxide in dinitrogen tetroxide/nitrogen dioxide. Image:Nitric-oxide-3D-vdW.png|{{center|'''[[Nitric oxide]]''', NO}} Image:Nitrogen-dioxide-3D-vdW.png|{{center|'''[[Nitrogen dioxide]]''', {{chem2|NO2}}}} Image:Nitrous-oxide-3D-vdW.png|{{center|'''[[Nitrous oxide]]''', {{chem2|N2O}}}} Image:Dinitrogen-trioxide-3D-vdW.png|{{center|'''[[Dinitrogen trioxide]]''', {{chem2|N2O3}}}} Image:Dinitrogen-tetroxide-3D-vdW.png|{{center|'''[[Dinitrogen tetroxide]]''', {{chem2|N2O4}}}} Image:Dinitrogen-pentoxide-3D-vdW.png|{{center|'''[[Dinitrogen pentoxide]]''', {{chem2|N2O5}}}} Image:Trinitramide-3D-spacefill.png|{{center|'''[[Trinitramide]]''', {{chem2|N4O6}}}} Due to relatively weak N–O bonding, all nitrogen oxides are unstable with respect to and , which is the principle behind the catalytic converter and prevents the combustion of the atmosphere.

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Nitrogen dioxide
Nitrogen dioxide is a chemical compound with the formula NO2. It is one of several nitrogen oxides. NO2 is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year for use primarily in the production of fertilizers. At higher temperatures it is a reddish-brown gas. It can be fatal if inhaled in large quantities. Nitrogen dioxide is a paramagnetic, bent molecule with C2v point group symmetry. It is included in the NOx family of atmospheric pollutants.
Nitrous acid
Nitrous acid (molecular formula HNO2) is a weak and monoprotic acid known only in solution, in the gas phase and in the form of nitrite (NO-2) salts. Nitrous acid is used to make diazonium salts from amines. The resulting diazonium salts are reagents in azo coupling reactions to give azo dyes. In the gas phase, the planar nitrous acid molecule can adopt both a syn and an anti form. The anti form predominates at room temperature, and IR measurements indicate it is more stable by around 2.3 kJ/mol.
Dinitrogen pentoxide
Dinitrogen pentoxide (also known as nitrogen pentoxide or nitric anhydride) is the chemical compound with the formula . It is one of the binary nitrogen oxides, a family of compounds that only contain nitrogen and oxygen. It exists as colourless crystals that sublime slightly above room temperature, yielding a colorless gas. Dinitrogen pentoxide is an unstable and potentially dangerous oxidizer that once was used as a reagent when dissolved in chloroform for nitrations but has largely been superseded by nitronium tetrafluoroborate ().
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