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

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Compounds

Polyatomic ions

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1. Iodate ion is used as a disinfectant. The formula of the iodate ion is

HIO₃^-

IO₃^2-

IO₄^-2

IO₄^-

IO₃^-

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

ClO₄^-2

ClO₃^2-

ClO₃^-

ClO₄^-

HClO₃^-

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

S₂O₃^-2

HSO₄^-

SO₄^2-

SO₄^-

SO₃^2-

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

sodium perchlorate

sodium chlorite

sodium chlorate

sodium chloride

sodium chloride trioxide

5. Chlorite compounds are extremely explosive when they come into contact with combustible material. The formula of the chlorite ion is:

ClO^2-

ClO₂^-2

ClO₃^-

ClO₂^-

HClO₃^-

6. Phosphate ion is a basic building block of minerals, bones, teeth, and DNA. The formula of the phosphate ion is:

HPO₄^-2

PO₃^-

PO₄^2-

PhO₂^-2

PO₄^3-

7. Sodium bicarbonate is "baking soda", the active ingredient in many antacids. The formula of the bicarbonate ion is:

HCO₃^-

HCO₃^2-

H₂CO₃^-

(CO₃)₂^4-

CO₃^2-

8. 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^-

HO₃^-

OH^-

HO^2-

HO₂⁺

9. Which of the following compounds contains a polyatomic ion?

Na₂SO₄

LiCl

C₆H₁₂O₆

CO₂

KBr

10. 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

BrO₄^-

HBrO₃^-

BrO₃^2-

BrO₃^-

BrO₄^-2

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