Iodous acid explained

Iodous acid is the chemical compound with the formula HIO2. Its salts are named iodites; these are exceedingly unstable and have been observed but never isolated. They will rapidly disproportionate to molecular iodine and iodates.

Other oxyacids

Iodous acid is part of a series of oxyacids in which iodine can assume oxidation states of −1, +1, +3, +5, or +7. A number of neutral iodine oxides are also known.

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Iodine oxidation state−1+1+3+5+7
NameHydrogen iodideHypoiodous acidIodous acidIodic acidPeriodic acid
FormulaHIHIOHIO2HIO3HIO4 or H5IO6