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Hydrochloric acid (denoted by the chemical formula HCl)
Hydrobromic acid (denoted by the chemical formula HBr)
Hydroiodic acid or hydriodic acid (denoted by the chemical formula HI)
Sulfuric acid (denoted by the chemical formula H2SO4)
Nitric acid (denoted by the chemical formula HNO3)
The strongest acid is perchloric acid on the left, and the weakest is hypochlorous acid on the far right.