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

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Compounds

Polyatomic ions

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1. Veterinarians administer an 0.2 percent potassium permanganate solution to cows and horses as an antidote for plant alkaloid poisoning. A bottle that contains potassium permanganate solution might be labelled:

K₂MnO₃

KMgO₄

KMnO₄

K₂MnO₄

KMnO₃

2. Deadly lead(II) acetate is sometimes called "sugar of lead" because it has a very sweet taste; it was once used to sweeten wine! Lead(II) acetate is written as:

PbC₂H₃O₂

Pb(C₂O₄)₂

Pb(C₂H₃O₂)₂

PbC₂O₄

PbCO₃

3. Dichromate ions are used in the tanning of leather. Dichromate ion is:

Cr₂O₃^2-

HCrO₃^-

HCrO₄^-

CrO₄^2-

Cr₂O₇^2-

4. 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:

ClO₃^2-

ClO₂^-

ClO₄^-2

ClO₃^-

ClO₄^-

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

ClO₃^2-

ClO₄^-

ClO₄^-2

ClO₃^-

HClO₃^-

6. NaClO₃ has been used in herbicides and in explosives. The name of this compound is:

sodium perchlorate

sodium chloride

sodium chlorate

sodium chloride trioxide

sodium chlorite

7. Periodate ion is used in staining procedures that improve the quality of microscopic images. The formula of the periodate ion is:

IO₄^-

IO₃^-

IO₃^2-

IO₄^-2

HIO₃^-

8. An old bottle labelled "sodium biphosphate" contains:

NaH₂PO₃

NaH₂PO₄

Na₂HPO₄

NaHPO₃

Na₃PO₄

9. Hydroxide ion solutions are sprayed on pretzels to give them their characteristic texture; the ion is removed by reaction with carbon dioxide during baking. The hydroxide ion is:

HO₂⁺

OH^-

HO^2-

HO₃^-

HO₂^-

10. Phosphate ion is the most common:

-2 anion

-1 anion

+1 anion

-3 anion

+1 cation

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