Question 1

Which of the following formulas corresponds to the acetate ion?

Accepted Answer

$\mathrm{C_2H_3O_2^-}$

Question 2

A solution contains both $\mathrm{SO_4^{2-}}$ and $\mathrm{SO_3^{2-}}$ ions. Which of the following correctly identifies their names?

Accepted Answer

Sulfate and sulfite

Question 3

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

Accepted Answer

$\mathrm{ClO^-}$

Question 4

A patient is diagnosed with cyanide poisoning. Which formula represents the cyanide ion?

Accepted Answer

$\mathrm{CN^-}$

Question 5

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

Accepted Answer

$\mathrm{HCO_3^-}$

Question 6

If a solution contains $\mathrm{Cr_2O_7^{2-}}$, what is the name of this ion and what color is it typically in aqueous solution?

Accepted Answer

Dichromate, orange

Question 7

Which of the following ions is a polyatomic cation?

Accepted Answer

$\mathrm{NH_4^+}$

Question 8

A chemist mixes a solution containing $\mathrm{MnO_4^-}$ with an organic compound. What is the expected role of $\mathrm{MnO_4^-}$ in this reaction?

Accepted Answer

Oxidizing agent

Question 9

Which of the following ions is most likely to increase the pH of a solution when added?

Accepted Answer

$\mathrm{OH^-}$

Question 10

Which formula represents the ion that is the conjugate base of phosphoric acid after losing two protons?

Accepted Answer

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

Question 11

A water sample is tested and found to contain $\mathrm{NO_3^-}$. What is the name of this ion and why is its presence a concern?

Accepted Answer

Nitrate; it can cause health issues such as methemoglobinemia

Question 12

Which of the following ions is most likely to form a precipitate with $\mathrm{Ba^{2+}}$ in aqueous solution?

Accepted Answer

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

Question 13

Which of the following ions is the conjugate acid of ammonia?

Accepted Answer

$\mathrm{NH_4^+}$

Question 14

A sample contains both $\mathrm{ClO_3^-}$ and $\mathrm{ClO_4^-}$. Which of the following correctly identifies their names?

Accepted Answer

Chlorate and perchlorate

Question 15

Which of the following ions is most likely to act as a buffer in blood plasma?

Accepted Answer

$\mathrm{HCO_3^-}$

Question 16

Which of the following ions is present in rust-removal solutions and is a strong oxidizer?

Accepted Answer

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

Question 17

Which of the following ions is most likely to be found in antacids used to treat heartburn?

Accepted Answer

$\mathrm{CO_3^{2-}}$

Question 18

A solution contains $\mathrm{ClO_2^-}$. What is the name of this ion and what is its oxidation state for chlorine?

Accepted Answer

Chlorite; +3

Question 19

Which of the following ions is most likely to be produced when $\mathrm{H_2SO_4}$ is dissolved in water?

Accepted Answer

$\mathrm{HSO_4^-}$

Question 20

Which of the following ions is most likely to be found in fertilizers and is essential for plant growth?

Accepted Answer

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

Common Polyatomic Ions: Formulas and Names

Study Guide - Practice Questions