If you use the Bronsted-Lowry definition of an acid as a proton donor, hydrochloric, hydrobromic and hydroiodic acids are all acids. Hydrogen chloride, hydrogen bromide and hydrogen iodide dissolve in and react with water to give their respective acids, which are strong acids.
However, although hydrogen fluoride dissolves in water, hydrofluoric acid is a weak acid.
Hydrogen halides are colorless gases at room temperature. Hydrogen fluoride has a higher boiling point than the other halides because it can form hydrogen bonds. The other hydrogen halides increase boiling points as you go down the periodic table.
http://www.chemguide.co.uk/inorganic/group7/acidityhx.html
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