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

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Companion Notes

Compounds

Polyatomic ions

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

sodium chlorite

sodium chloride

sodium perchlorate

sodium chlorate

sodium chloride trioxide

2. 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-

PO₄^3-

PhO₂^-2

3. The SCN^- ion forms a bright red complex with iron(II) ions. The SCN^- ion is called the:

cyanide ion

thiocyanide ion

cyanate ion

thiocyanate ion

sulfurocyanide ion

thiocyanite ion

4. Which of the following is the bisulfate ion?

S₂O₃^2-

HSO₄^-

S₂O₈^2-

(SO₄^2-)₂

SO₄^2-

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

HCrO₃^-

CrO₄^2-

HCrO₄^-

Cr₂O₃^2-

Cr₂O₇^2-

6. 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

BrO₃^-

BrO₃^2-

BrO₄^-2

BrO₄^-

HBrO₃^-

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

H₂CO₃^-

HCO₃^-

HCO₃^2-

CO₃^2-

(CO₃)₂^4-

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

IO₃^-

IO^2-

HIO₃^-

IO₂^-2

IO₂^-

9. The NO₄^- ion exists in small quantities in the upper atmosphere. Using the naming guidelines for polyatomic ions, the name of this ion would be:

nitrite

pernitrate

nitrate

hyponitrite

supernitrate

10. Ammonium nitrate is used as a fertilizer by farmers and as an explosive by terrorists. The formula of ammonium nitrate is

(NH₄)₂NO₂

NH₄NO₃

AmNO₂

NH₃NO₂

NH₃NO₃

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