A '''gas evolution reaction''' is a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide.<ref>{{Cite web|title=CHEMICAL REACTIONS|url=http://www.ric.edu/faculty/ptiskus/reactions/index.htm|access-date=2020-11-28|website=www.ric.edu}}</ref><ref>{{Cite web|date=2017-08-11|title=7.8: Acid–Base and Gas Evolution Reacted|url=https://chem.libretexts.org/Courses/Woodland_Community_College/WCC%3A_Chem_10_-_Concepts_of_Chemistry/Chapters/07%3A_Chemical_Reactions/7.08%3A_Acid%E2%80%93Base_and_Gas_Evolution_Reactions|access-date=2020-11-28|website=Libretexts|language=en}}</ref> Gas evolution reactions may be carried out in a fume chamber when the gases produced are poisonous when inhaled or explosive.{{cn|date=February 2026}}
==Examples== * A replacement reaction concerning zinc metal and dilute sulfuric acid. : <chem>Zn + H_2SO_4 (dil) -> ZnSO_4 + H_2 ^</chem> : In this example, diatomic hydrogen gas is released. Dilute hydrochloric acid can be used in place of dilute sulfuric acid.
* A replacement reaction where gaseous hydrogen chloride and fluorine gas react to release diatomic chlorine gas (because fluorine is more electronegative): : <chem>2HCl + F_2 -> 2HF + Cl_2 ^</chem>
==See also== * Gasogene * Kipps apparatus * Gas generator * Thermal decomposition * Oxygen evolution
==References== {{Reflist}}
Category:Chemical reactions Category:Industrial gases