The hypothetical acid iodous acid, HIO2, would be made from the
hypothetical iodite ion, IO2-.
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From the Scrabble dictionary:
amadous
apodous
decapodous
hazardous
horrendous
iodous
molybdous
nodous
nonhazardous
palladous
stupendous
tremendous
ultrahazardous
uropodous
vanadous
vodous
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No iodite salts have been isolated. the corresponding acid
iodous acid is unknown. The only well known halites are the
chlorites, a few bromites have been prepared by roundabout
routes.