Common Polyatomic Ions

Question 1

CrO₄^2-

Answer 1

Chromate

Question 1

PO₄^3-

Answer 1

Phosphate

Question 2

C₂H₃O₂^-

Answer 2

Acetate

Question 2

SO₄^2-

Answer 2

Sulfate

Question 2

HSO₄^-

Answer 2

Hydrogen Sulfate

Question 3

SO₃^2-

Answer 3

Sulfite

Question 4

ClO₄^-

Answer 4

Perchlorate

Question 5

S₂O₃^2-

Answer 5

Thiosulfate

Question 6

CN^-

Answer 6

Cyanide

Question 6

MnO₄^-

Answer 6

Permaganate

Question 7

ClO^-

Answer 7

Hypochlorite

Question 8

H₂PO₄^-

Answer 8

Dihydrogen phosphate

Question 10

Hg₂²⁺

Answer 10

Mercury (I) or Mercurous

Question 12

ClO₂^-

Answer 12

Chlorite

Question 14

CO₃^2-

Answer 14

Carbonate

Question 15

C₂O₄^2-

Answer 15

Oxalate

Question 16

HSO₃^-

Answer 16

Hydrogen Sulfite or Bisulfite

Question 18

ClO₃^-

Answer 18

Chlorate

Question 18

NO₃^-

Answer 18

Nitrate

Question 19

NO₂^-

Answer 19

Nitrite

Question 20

NH₄⁺

Answer 20

Ammonium

Question 21

OH^-

Answer 21

Hydroxide

Question 23

O₂^2-

Answer 23

Peroxide

Question 24

Cr₂O₇^2-

Answer 24

Dichromate

Question 25

HPO₄^2-

Answer 25

Monohydrogen Phosphate

Question 26

HCO₃^-

Answer 26

Hydrogen Carbonate or Bicarbonate