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Home :Companion Notes :Compounds :Polyatomic ionsPrint | Comment

Quiz
1. An old bottle labelled "sodium biphosphate" contains:
NaH2PO3Na3PO4NaHPO3Na2HPO4NaH2PO4
2. Sodium aluminate is used in fabric printing processes. If the formula is NaAlO2, the charge on the aluminate ion must be:
0+2-2-1+1
3. Nitrates are used in making rocket propellants, fertilizers, dynamite, and fireworks. The formula of the nitrate ion is:
NO4-N2O3-2NO3-NO2-NO32-
4. If the selenate ion has formula SeO42-, the selenite ion might be:
SeO32-SeO43-SeO4+2 SeO52-SeO4-
5. 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+HO2-HO3-HO2-OH-
6. Nitrite ion is used in bleaching, dyeing and printing fabrics. The formula of the nitrite ion is:
HNO4-NO2-NO3-N2O3-2NO42-
7. 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:
CO22-CO2-CO3-HCO3-CO32-
8. Phosphate ion is the most common:
-3 anion+1 cation+1 anion-1 anion-2 anion
9. 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-BrO4-2BrO3-HBrO3-BrO32-
10. Ammonium nitrate is used as a fertilizer by farmers and as an explosive by terrorists. The formula of ammonium nitrate is
(NH4)2NO2NH3NO3NH4NO3AmNO2NH3NO2
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Copyright © 1997-2005 by Fred Senese
Comments & questions to fsenese@frostburg.edu
Last Revised 06/11/07.URL: http://antoine.frostburg.edu/chem/senese/101/compounds/polyatomic-quiz.shtml