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

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