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

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Companion Notes

Compounds

Polyatomic ions

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1. Sodium sulfate occurs in nature as the minerals mirabilite and thenardite. The formula of the sulfate ion is:

SO₄^-

SO₃^2-

S₂O₃^-2

SO₄^2-

HSO₄^-

2. If the selenate ion has formula SeO₄^2-, the selenite ion might be:

SeO₄^3-

SeO₅^2-

SeO₃^2-

SeO₄⁺²

SeO₄^-

3. Perbromate ion is extremely unstable for quantum mechanical reasons. If it existed, the formula of the perbromate ion could be:

BrO₄^-2

BrO₃^2-

BrO₄^-

HBrO₃^-

BrO₃^-

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

HCrO₃^-

CrO₄^2-

HCrO₄^-

Cr₂O₃^2-

Cr₂O₇^2-

5. if AsO_{4^3- is the arsenate ion, the name of the AsO}3^3- ion is expected to be:

hemiarsenate

arsenite

perarsenate

arsenide

hypoarsenite

6. 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:

ClO₄^-2

ClO₄^-

ClO₃^2-

ClO₃^-

ClO₂^-

7. 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:

OH^-

HO₂^-

HO₂⁺

HO₃^-

HO^2-

8. Hypobromite compounds are used to treat water supplies that are heavily contaminated with bacteria. The formula of the hypobromite ion is:

BrO^-

BrO₂^-2

HBrO^-

BrO^2-

BrO₃^-

9. Sulfite ion is often used to "fix" photographic film during development. The formula of the sulfite ion is:

HSO₄^-

SO₃^2-

SO₄^2-

S₂O₃^-2

SO₃^-

10. Stable compounds containing the iodite ion have never been prepared. The formula of the iodite ion could be:

IO₂^-

IO₂^-2

IO^2-

IO₃^-

HIO₃^-

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