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Chlorine was used in World War 1. It is a chemical element, and it is an extremely active oxidizer. A chlorine atom travels around with a buddy to make Cl2 which is what is called a diatomic molecule (two atoms combined to make a molecule). When chlorine comes in contact with water, it make hydrochloric acid, HCl, which is a very strong acid. Anyone who breathes in chlorine gas will be in very serious trouble. All the tissues that line the nose, the throat, and the lungs are moist, and HCl will form when Cl2 that is breathed in comes in contact with that moisture. Wikipedia has a brief article on the use of chlorine in WWI, and a link is provided.

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17y ago

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