Question 1

Which of the following polyatomic ions has the formula $\mathrm{CO_3^{2-}}$?

Accepted Answer

Carbonate

Question 2

A solution contains both $\mathrm{SO_4^{2-}}$ and $\mathrm{SO_3^{2-}}$ ions. Which of the following statements is correct regarding their chemical names?

Accepted Answer

$\mathrm{SO_4^{2-}}$ is sulfate and $\mathrm{SO_3^{2-}}$ is sulfite.

Question 3

Which of the following ions is commonly found in household bleach and is responsible for its disinfecting properties?

Accepted Answer

Hypochlorite ($\mathrm{ClO^-}$)

Question 4

A compound contains the ion $\mathrm{NH_4^+}$. What is the correct name for this ion?

Accepted Answer

Ammonium

Question 5

Which of the following ions contains chromium in the +6 oxidation state?

Accepted Answer

Dichromate ($\mathrm{Cr_2O_7^{2-}}$)

Question 6

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

Accepted Answer

Cyanide: $\mathrm{CN^-}$

Question 7

A laboratory technician accidentally mixes a solution containing $\mathrm{Ba^{2+}}$ with one containing $\mathrm{SO_4^{2-}}$. What precipitate is most likely to form?

Accepted Answer

$\mathrm{BaSO_4}$ (barium sulfate)

Question 8

Which of the following ions is a common component of antacids and helps neutralize stomach acid?

Accepted Answer

Hydroxide ($\mathrm{OH^-}$)

Question 9

Which of the following ions is responsible for the purple color in potassium permanganate solutions?

Accepted Answer

Permanganate ($\mathrm{MnO_4^-}$)

Question 10

Which of the following ions is the conjugate base of acetic acid?

Accepted Answer

Acetate ($\mathrm{C_2H_3O_2^-}$)

Question 11

A sample contains $\mathrm{Hg_2^{2+}}$. What is the correct name for this ion?

Accepted Answer

Mercury (I)

Question 12

Which of the following ions is present in baking soda and acts as a weak base in water?

Accepted Answer

Bicarbonate ($\mathrm{HCO_3^-}$)

Question 13

Which of the following ions contains the greatest number of oxygen atoms?

Accepted Answer

Dichromate ($\mathrm{Cr_2O_7^{2-}}$)

Question 14

Which of the following ions is most likely to form a bright yellow precipitate with lead(II) ions ($\mathrm{Pb^{2+}}$)?

Accepted Answer

Chromate ($\mathrm{CrO_4^{2-}}$)

Question 15

Which of the following ions is the conjugate acid of ammonia ($\mathrm{NH_3}$)?

Accepted Answer

Ammonium ($\mathrm{NH_4^+}$)

Question 16

Which of the following ions is used in cyanide extraction processes in gold mining?

Accepted Answer

Cyanide ($\mathrm{CN^-}$)

Question 17

Which of the following ions is most likely to act as a reducing agent in redox reactions?

Accepted Answer

Thiosulfate ($\mathrm{S_2O_3^{2-}}$)

Question 18

Which of the following ions is present in fertilizers and is essential for plant DNA synthesis?

Accepted Answer

Phosphate ($\mathrm{PO_4^{3-}}$)

Question 19

A water sample is tested and found to contain $\mathrm{NO_2^-}$. What is the correct name for this ion?

Accepted Answer

Nitrite

Question 20

Which of the following ions is most likely to be found in a solution of sodium thiosulfate, commonly used in photographic fixing?

Accepted Answer

Thiosulfate ($\mathrm{S_2O_3^{2-}}$)

Common Polyatomic Ions and Their Formulas

Study Guide - Practice Questions

Study Guide - Flashcards