Common Polyatomic Ions

Question 1

C₂H₃O₂^-

Answer 1

acetate

Question 2

CO₃^2-

Answer 2

carbonate

Question 3

HCO₃^-

Answer 3

hydrogen carbonate

or bicarbonate

Question 4

OH^-

Answer 4

hydroxide

Question 5

NO₃^-

Answer 5

nitrate

Question 6

NO₂^-

Answer 6

nitrite

Question 7

CrO₄^2-

Answer 7

chromate

Question 8

Cr₂O₇^2-

Answer 8

dichromate

Question 9

PO₄^3-

Answer 9

phosphate

Question 10

HPO₄^2-

Answer 10

dihydrogen phosphate

Question 11

NH₄⁺

Answer 11

ammonium

Question 12

ClO^-

Answer 12

hypochlorite

Question 13

ClO₂^-

Answer 13

chlorite

Question 14

ClO₃^-

Answer 14

chlorate

Question 15

ClO₄^-

Answer 15

perchlorate

Question 16

MnO₄^-

Answer 16

permanganate

Question 17

SO₄^2-

Answer 17

sulfate

Question 18

SO₃^2-

Answer 18

sulfite

Question 19

HSO₃^-

Answer 19

hydrogen sulfite

or bisulfite

Question 20

HSO₄^-

Answer 20

hydrogen sulfate

or bisulfate

Question 21

O₂^2-

Answer 21

peroxide

Question 22

CN^-

Answer 22

cyanide

Question 23

ClO

Answer 23

hypochlorite

Question 24

H₂PO₄^-

Answer 24

dihydrogen phosphate

Question 25

C₂O₄^2-

Answer 25

oxalate

Question 26

SiO₃^2-

Answer 26

silicate

Question 27

3- charge polyatomic anions

Answer 27

phosphite, phosphate

Question 28

1+ Polyatomic Cation

Answer 28

NH₄⁺ - ammonium

Question 29

2- charge Polyatomic Anions

Answer 29

hydrogen phosphate, oxalate, sulfite + sulfate, carbonate chromate+ dichromate, silicate