Adjective
Pertaining to, or derived from, chlorine having a valence lower than in chlorous compounds.
Source: Webster's dictionaryThe acid forms of these anions are hypochlorous acid (HOCl), chlorous acid (HClO 2), chloric acid (HClO 3 ) and perchloric acid (HClO 4 ), respectively. Source: Internet
When chlorine is inhaled at concentrations greater than 30 ppm, it reacts with water and cellular fluid, producing hydrochloric acid (HCl) and hypochlorous acid (HClO). Source: Internet