Question 1

Which of the following is the correct chemical formula for the dichromate ion?

Accepted Answer

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

Question 2

A solution contains both sulfate and carbonate ions. Which of the following formulas represents the carbonate ion?

Accepted Answer

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

Question 3

Which of the following polyatomic ions has a 1+ charge?

Accepted Answer

$$\mathrm{NH_4$^+}$$

Question 4

A patient is given a medication containing the thiosulfate ion. What is the correct formula for thiosulfate?

Accepted Answer

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

Question 5

Which of the following ions is commonly found in household bleach?

Accepted Answer

$$\mathrm{ClO^-}$$

Question 6

A fertilizer contains ammonium phosphate. What is the correct formula for the phosphate ion?

Accepted Answer

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

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

$$\mathrm{C_2H_3O_2^-}$$

Question 9

A laboratory experiment requires the use of the dichromate ion. What is the charge on the dichromate ion?

Accepted Answer

$$2-$$

Question 10

Which of the following ions is present in baking soda?

Accepted Answer

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

Question 11

Which of the following ions contains arsenic and has a 3- charge?

Accepted Answer

$$\mathrm{$$AsO_4$$^{3-}}$$

Question 12

A water treatment plant uses the hypochlorite ion for disinfection. What is the correct formula for hypochlorite?

Accepted Answer

$$\mathrm{ClO^-}$$

Question 13

Which of the following ions is a common component of rust removers and is known for its strong oxidizing properties?

Accepted Answer

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

Question 14

Which of the following ions is the conjugate base of sulfurous acid?

Accepted Answer

$$\mathrm{SO_3$^{2-}}$$

Question 15

A student is asked to write the formula for the hydrogen sulfate ion. Which is correct?

Accepted Answer

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

Question 16

Which of the following ions is found in hydrogen peroxide and is responsible for its bleaching action?

Accepted Answer

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

Question 17

Which of the following is the correct formula for the oxalate ion, a common chelating agent in analytical chemistry?

Accepted Answer

$$\mathrm{C_2O_4$$^{2-}$$}$$

Question 18

Which of the following ions is the main component of the mineral apatite, found in bones and teeth?

Accepted Answer

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

Question 19

A sample contains both chromate and dichromate ions. Which formula represents the chromate ion?

Accepted Answer

$$\mathrm{$$CrO_4$$^{2-}}$$

Question 20

Which of the following ions is a common ingredient in cyanide-based gold extraction processes?

Accepted Answer

$$\mathrm{CN^-}$$

Essential Polyatomic Ions for General Chemistry

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