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All major polyatomic ions that need memorizing for Kuei test
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Ammonium
NH₄⁺
Nitrate
NO₃⁻
Nitrite
NO₂⁻
Sulfate
SO₄²⁻
Sulfite
SO₃²⁻
Phosphate
PO₄³⁻
Phosphite
PO₃³⁻
Carbonate
CO₃²⁻
Perchlorate
ClO₄⁻
Chlorate
ClO₃⁻
Hypochlorite
ClO⁻
Hypoiodite
IO⁻
Hydrogen carbonate
HCO₃⁻
Hydrogen sulfate
HSO₄⁻
Hydrogen sulfite
HSO₃⁻
Hydrogen phosphate
HPO₄²⁻
Dihydrogen phosphate
H₂PO₄⁻
Hydroxide
OH⁻
Cyanide
CN⁻
Permanganate
MnO₄⁻
Dichromate
Cr₂O₇²⁻
Thiosulfate
S₂O₃²⁻
Peroxide
O₂²-
Dichromate
Cr2O72-
Chromate
CrO₄²-
Cyanate
OCN-
Thiocynate
SCN-
Thiosulfate
S2O3(2-)