chlorine trioxide
Chemistry
noun
1An oxide of chlorine (dichlorine trioxide), Cl2O3, which is a brown crystalline substance at low temperatures and is explosively unstable.
2A dark red oxide of chlorine formed by the reaction of chlorine dioxide and ozone, existing as a dimeric gas, Cl2O6, or as an ionic liquid or solid, [ClO2 +ClO4 −] (dichlorine hexoxide.).
Origin
Mid 19th century.
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