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Sorry, this answer is incorrect. Sulfuric acid formed on the eyes when onions are sliced. Hydrochloric acid is actually a major component of gastric acid that is used to break down food in the stomach. It is also responsible for limiting bacterial growth within the stomach. Knowledge about hydrochloric acid is old; the acid was first discovered by the Iranian alchemist Jabir ibn Hayyan around the year 800 and is part of Aqua Regia, which dissolved gold and inspired alchemist through the Middle Ages in their quest to make gold. Today hydrochloric acid is widely used; it is part of many consumer products, like cleaners, ion exchangers etc. It is also an important starting material for many industrial syntheses.
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