HCIO2 is "chlorous acid"
it is an acid
acid
HClO3 is chloric acid. HCIO3 does not exist. There is more information at the related link.
HCIO3
+5
'+5'
15
The oxidation state of chlorine is 5.
HCIO
The chlorous acid chemical formula is HClO2.
The chemical formula for Chloric Acid is HCIO3