Question 1

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

Accepted Answer

$$\mathrm{$$MnO_4$$^-}$$

Question 2

A student is asked to write the formula for ammonium sulfate, a common fertilizer. Which of the following is correct?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 3

Which polyatomic ion is present in both sodium bicarbonate (baking soda) and in the buffer system of human blood?

Accepted Answer

$$\mathrm{$$HCO_3$$^-}$$

Question 4

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

Accepted Answer

Hydroxide: $$\mathrm{OH^-}$$

Question 5

A solution contains both $$\mathrm{$$ClO_3$$^-}$$ and $$\mathrm{$$ClO_4$$^-}. $$Which names correspond to these ions, respectively?

Accepted Answer

Chlorate and Perchlorate

Question 6

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

Accepted Answer

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

Question 7

A patient is treated for cyanide poisoning. Which of the following is the correct formula for the cyanide ion?

Accepted Answer

$$\mathrm{CN^-}$$

Question 8

Which of the following compounds contains the dichromate ion?

Accepted Answer

$$\mathrm{K_2Cr_2O_7}$$

Question 9

Which of the following ions is a common ingredient in bleach and is responsible for its disinfecting properties?

Accepted Answer

$$\mathrm{ClO^-}$$

Question 10

Which of the following correctly represents the formula for hydrogen phosphate?

Accepted Answer

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

Question 11

A laboratory technician needs to prepare a buffer solution using a weak acid and its conjugate base. Which of the following pairs would be suitable?

Accepted Answer

Acetic acid ($$\mathrm{CH_3COOH}) $$and acetate ($$\mathrm{C_2H_3O_2^-})$$

Question 12

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

Accepted Answer

$$\mathrm{$$HSO_4$$^-}$$

Question 13

Which of the following ions is most likely to be found in a solution of hydrogen peroxide that has decomposed?

Accepted Answer

$$\mathrm{O_2$^{2-}}$$

Question 14

A sample of water is found to contain both $$\mathrm{NO_2$^-}$$ and $$\mathrm{NO_3$^-}. $$What are the names of these ions?

Accepted Answer

Nitrite and Nitrate

Question 15

Which of the following ions is the conjugate base of dihydrogen phosphate ($$\mathrm{H_2PO_4^-}$$)?

Accepted Answer

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

Question 16

Which of the following ions is present in both Epsom salt and in the structure of DNA?

Accepted Answer

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

Question 17

Which of the following ions would you expect to be present in a solution of sodium dichromate?

Accepted Answer

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

Question 18

Which of the following ions is commonly used in the treatment of cyanide poisoning due to its ability to bind cyanide ions?

Accepted Answer

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

Question 19

Which of the following ions is the conjugate acid of the carbonate ion ($$\mathrm{CO_3$^{2-}}$$)?

Accepted Answer

$$\mathrm{$$HCO_3$$^-}$$

Common Polyatomic Ions in General Chemistry

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