Abstract

Synonyms: nitrogen peroxide; formula: NO₂; MW 46.01; CAS [10102-44-0]; occurs in automobile exhaust and cigarette smoke; produced by the reaction of nitric acid with metals, decomposition of nitrates, or during fire; reddish-brown fuming liquid or gas; sharp pungent odor; liquefies at 21°C; solidifies at −9.3°C; density of liquid 1.45 at 20°C; vapor 1.58 (air = 1); reacts with water to form nitric acid and nitrogen oxide; reacts with alkalies to form nitrates and nitrites; highly toxic.