The ternary acid chart:
Name hypo...ous ...ous ...ic per...ic
chlor HClO HClO2 HClO3 HClO4
brom HBrO HBrO2 HBrO3 HBrO4
iod HIO HIO2 HIO3 HIO4
sulfur H2SO2 H2SO3 H2SO4
nitr HNO2 HNO3
phosphor H3PO2 H3PO3 H3PO4
carbon H2CO3
chrom H2CrO4
dichrom H2Cr2O7
mangan HMnO4


Strong Acids are indicated so: HNO3
Weak Acids are indicated so: HNO2