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**Molecular formula:** N₂O₄
**Molar mass:** 92,012 g/mol
**Information:** Nitrogen dioxide is a highly poisonous gas. It exists in two forms, dimeric (N₂O₄) and monomeric . The dimeric form is colourless and the monomer is a reddish brown gas.
**Use:** It is used as an oxidizer in rocket engines.
**Appearance:** It is part of the exhaust gases of internal combustion engines and contributes to environmental pollution. It contributes to the formation of acid rain.