What chlorine gas is Who used it first?
The gas chlorine is a halogen with the chemical symbol Cl; chlorine was discovered by Carl Wilhelm Scheele.
Chlorine gas was first observed by a Belgian chemist, Jan Baptist van Helmont, in about the year 1630, but the Swedish chemist Carl Wilhelm Scheele is credited with isolating Chlorine as an element in 1774, although he didn't recognize it as an element. That realization came in the early 1800's. Chlorine gas was first used as a weapon on April 22, 1915, at the Battle of Ypres. For more information, look up "Chlorine" on Wikipedia.
Chlorine and Mustard gas are gaseous chemical compounds that are highly toxic to humans. They were both used as weapons during the First World War and both compounds were favored by the Central powers. Chlorine gas was the first chemical weapon used in the war at the second battle of Ypres. It was released from large tanks and allowed to drift towards Allied positions. Chlorine is heavier than air and thus stays close to ground…