General Chemistry Online: Companion Notes: Compounds: Polyatomic ions: Quiz

3. Chlorine dioxide is used as an oxidizing agent in many industrial processes. Because it is explosive, it is never shipped, but prepared as needed by a reaction involving the more stable chlorate ion. The formula of the chlorate ion is:

ClO₃^-

ClO₃^2-

ClO₄^-2

ClO₂^-

ClO₄^-

4. Nitrite ion is used in bleaching, dyeing and printing fabrics. The formula of the nitrite ion is:

NO₄^2-

NO₃^-

HNO₄^-

NO₂^-

N₂O₃^-2

5. Perchlorate compounds are used in explosives and jet fuels. The formula of the perchlorate ion is

ClO₃^-

ClO₄^-

HClO₃^-

ClO₄^-2

ClO₃^2-

6. NaClO₄ is used to manufacture explosives. NaClO is the active ingredient in Chlorox bleach. The names of the anions in these compounds are, respectively,

	perchlorate and hypochlorite		exochloride and endochloride
	tetroxychlorine and monoxychlorine		hyperchlorite and hypochlorite
	chlorate and chlorite		quadrochloroxide and monochloroxide

7. Bromate ion was baked into bread until recently as a preservative; it has been found to cause cancer in laboratory animals. The formula of the bromate ion is

HBrO₃^-

BrO₄^-

BrO₄^-2

BrO₃^2-

BrO₃^-

8. Sodium aluminate is used in fabric printing processes. If the formula is NaAlO₂, the charge on the aluminate ion must be:

-1

-2

9. Hard water contains high concentrations of calcium ions. The water is "softened" by treatment with carbonate ions, which precipitates the calcium as insoluble calcium carbonate. The formula of carbonate ion is:

CO₃^-

CO₂^-

CO₂^2-

HCO₃^-

CO₃^2-

10. Sodium peroxide can be used for oxygen generation in diving bells and submarines, since it reacts with carbon dioxide and produces oxygen gas. The peroxide ion has the formula:

O^2-

O₃^-

O₂^-

O₂⁺

O₂^2-

General Chemistry Online! Quiz