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

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