Question 1

Which of the following is the correct formula and charge for the acetate ion?

Accepted Answer

$\mathrm{C_2H_3O_2^-}$

Question 2

A solution contains both sulfate and sulfite ions. Which formulas correctly represent these ions?

Accepted Answer

$\mathrm{SO_4^{2-}}$ (sulfate) and $\mathrm{SO_3^{2-}}$ (sulfite)

Question 3

Which of the following polyatomic ions contains a transition metal?

Accepted Answer

$\mathrm{MnO_4^-}$

Question 4

What is the correct name for $\mathrm{HCO_3^-}$?

Accepted Answer

Bicarbonate (or hydrogen carbonate)

Question 5

A patient is given a medication containing $\mathrm{NH_4^+}$. What is the name of this ion?

Accepted Answer

Ammonium

Question 6

Which of the following ions is a cation?

Accepted Answer

$\mathrm{Hg_2^{2+}}$

Question 7

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

Accepted Answer

$\mathrm{ClO_4^-}$: Perchlorate

Question 8

A laboratory experiment produces a precipitate of $\mathrm{BaSO_4}$. Which polyatomic ion is present in this compound?

Accepted Answer

Sulfate ($\mathrm{SO_4^{2-}}$)

Question 9

Which of the following ions has a $2-$ charge?

Accepted Answer

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

Question 10

What is the formula for the ion commonly known as permanganate?

Accepted Answer

$\mathrm{MnO_4^-}$

Question 11

Which of the following ions is most likely to be found in a solution of household bleach?

Accepted Answer

$\mathrm{ClO^-}$

Question 12

A fertilizer contains both phosphate and nitrate ions. What are their correct formulas?

Accepted Answer

$\mathrm{PO_4^{3-}}$ and $\mathrm{NO_3^-}$

Question 13

Which of the following is the correct formula for thiosulfate?

Accepted Answer

$\mathrm{S_2O_3^{2-}}$

Question 14

Which of the following ions is the conjugate base of sulfuric acid ($\mathrm{H_2SO_4}$)?

Accepted Answer

$\mathrm{HSO_4^-}$

Question 15

A water sample is tested and found to contain $\mathrm{Cr_2O_7^{2-}}$. What is the name of this ion?

Accepted Answer

Dichromate

Question 16

Which of the following ions is present in both baking soda and antacids?

Accepted Answer

$\mathrm{HCO_3^-}$

Question 17

Which of the following ions is a component of DNA and is essential for energy transfer in cells?

Accepted Answer

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

Question 18

A sample contains both hydrogen phosphate and dihydrogen phosphate ions. What are their formulas?

Accepted Answer

$\mathrm{HPO_4^{2-}}$ and $\mathrm{H_2PO_4^-}$

Question 19

Which of the following ions is responsible for the blue color in a solution of copper(II) sulfate?

Accepted Answer

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

Question 20

Which of the following ions is commonly used in explosives and fertilizers?

Accepted Answer

$\mathrm{NO_3^-}$

Polyatomic Ions: Essential List for Introductory Chemistry

Study Guide - Practice Questions