Q: A solution contains both ammonium and nitrate ions. Which of the following correctly represents the formulas for these ions?

$$\mathrm{NH_4$^+}$$ \text{ and } \mathrm{$$NO_3$$^-}$

Q: Which of the following correctly matches the ion with its name?

$$\mathrm{CN^-}$$ \text{ is cyanide}

Q: A sample contains both perchlorate and chlorate ions. Which formulas represent these ions?

$$\mathrm{$$ClO_4$$^-}$$ \text{ and } \mathrm{$$ClO_3$$^-}$

Q: A water sample is tested and found to contain both sulfite and sulfate ions. Which formulas represent these ions?

$$\mathrm{SO_3$^{2-}}$$ \text{ and } \mathrm{$$SO_4$$^{2-}}$

Question 1

Which of the following is the correct formula for the sulfate ion?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 2

A solution contains both ammonium and nitrate ions. Which of the following correctly represents the formulas for these ions?

Accepted Answer

$$\mathrm{NH_4$^+}$$ 	ext{ and } \mathrm{$$NO_3$$^-}$

Question 3

Which polyatomic ion is responsible for the basicity of household cleaning products such as lye?

Accepted Answer

$$\mathrm{OH^-}$$

Question 4

A chemist needs to prepare a solution containing hydrogen phosphate. Which formula should they use?

Accepted Answer

$$\mathrm{$$HPO_4$$^{2-}}$$

Question 5

Which of the following ions contains chromium in its highest common oxidation state?

Accepted Answer

$$\mathrm{Cr_2O_7$$^{2-}$$}$$

Question 6

A student is asked to write the formula for the ion found in hydrogen carbonate antacids. Which is correct?

Accepted Answer

$$\mathrm{$$HCO_3$$^-}$$

Question 7

Which of the following ions is a strong oxidizing agent commonly used in water treatment?

Accepted Answer

$$\mathrm{$$MnO_4$$^-}$$

Question 8

Which of the following correctly matches the ion with its name?

Accepted Answer

$$\mathrm{CN^-}$$ 	ext{ is cyanide}

Question 9

A sample contains both perchlorate and chlorate ions. Which formulas represent these ions?

Accepted Answer

$$\mathrm{$$ClO_4$$^-}$$ 	ext{ and } \mathrm{$$ClO_3$$^-}$

Question 10

Which of the following ions is present in hydrogen peroxide and is responsible for its bleaching properties?

Accepted Answer

$$\mathrm{O_2$^{2-}}$$

Question 11

Which of the following ions is amphiprotic, meaning it can act as both an acid and a base?

Accepted Answer

$$\mathrm{$$HCO_3$$^-}$$

Question 12

A fertilizer contains ammonium phosphate. Which of the following is the correct formula for the phosphate ion in this compound?

Accepted Answer

$$\mathrm{PO_4$^{3-}}$$

Question 13

Which of the following ions is found in vinegar and is responsible for its sour taste?

Accepted Answer

$$\mathrm{C_2H_3O_2^-}$$

Question 14

A patient is treated for cyanide poisoning. Which of the following is the correct formula for the cyanide ion?

Accepted Answer

$$\mathrm{CN^-}$$

Question 15

Which of the following ions is the conjugate base of sulfuric acid's first deprotonation?

Accepted Answer

$$\mathrm{$$HSO_4$$^-}$$

Question 16

Which of the following ions would you expect to find in a solution of sodium hypochlorite, the active ingredient in household bleach?

Accepted Answer

$$\mathrm{ClO^-}$$

Question 17

A student mixes a solution of potassium dichromate with an acid. Which polyatomic ion is present in potassium dichromate?

Accepted Answer

$$\mathrm{Cr_2O_7$$^{2-}$$}$$

Question 18

Which of the following ions is present in both sodium nitrate and potassium nitrate fertilizers?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 19

Which of the following ions is the conjugate acid of the phosphate ion?

Accepted Answer

$$\mathrm{$$HPO_4$$^{2-}}$$

Question 20

A water sample is tested and found to contain both sulfite and sulfate ions. Which formulas represent these ions?

Accepted Answer

$$\mathrm{SO_3$^{2-}}$$ 	ext{ and } \mathrm{$$SO_4$$^{2-}}$

Common Polyatomic Ions: Names, Formulas, and Properties

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