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- 1. Multiple Choice
Which process involves the transfer of electrons?
double replacement
neutralization
oxidation-reduction
sublimation
- 2. Multiple Choice
During which process does an atom gain one or more electrons?
transmutation
reduction
oxidation
neutralization
- 3. Multiple Choice
Which change in oxidation number indicates oxidation?
-1 to +2
-1 to -2
+2 to -3
+3 to +2
- 4. Multiple Choice
The oxidation number of nitrogen in N2 is
+1
0
+3
-3
- 5. Multiple Choice
The oxidation numbers of all the atoms in H2SO4 must add up to
0
+5
+9
+16
- 6. Multiple Choice
Which of these equations represents a redox reaction?
Ca(HCO3)2 --> CaCO3 + H2O + CO2
CH3COOH + NaOH --> CH3COONa + H2O
Zn + 2FeCl3 --> ZnCl2 + 2FeCl2
NaCl + AgNO3 --> AgCl + NaNO3
- 7. Multiple Choice
What element is being Oxidized?IHSO - 8. Multiple ChoiceIn the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?ZincHydrogenOxygenNone - 9. Multiple ChoiceWhat element is being Reduced?NHOS
- 10. Multiple ChoiceOxygen always has an oxidation number of...-112-2
- 11. Multiple ChoiceIn the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________ReducedSynthesizedOxidizedNone of the above - 12. Multiple ChoiceIf an atom loses electrons during a chemical reaction, the atom was:OxidizedReducedNeutralizedPrecipitated
- 13. Multiple ChoiceWhat substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3IronFluorineOxygen - 14. Multiple ChoiceWhich substance is reduced in the following reaction?
NaOH + Li --> LiOH + NaLiNaOH - 15. Multiple ChoiceWhen Cr3+ changes to Cr, the chromium ion is said to have beenoxidized because it gained 3e.oxidized because it lost 3e.reduced because it gained 3e.reduced because it lost 3e.
- 16. Multiple ChoiceIs calcium oxidized or reduced in the following reaction?
2 CaO--> 2 Ca + O2OxidizedReduced - 17. Multiple ChoiceIf in a reaction, copper is reduced; its number of electrons has:IncreasedDecreasedRemained ConstantVaries Randomly
- 18. Multiple ChoiceWhich are examples of reduction?I and III and IIIII and IIII, II and III
- 19. Multiple ChoiceWhich change does nitrogen undergo oxidation?ABCD
- 20. Multiple ChoiceWhich of the following will always have an oxidation number of +1 when in a compound?MgCaNaS
- 21. Multiple ChoiceAs a free element (uncombined), oxygen will have an oxidation number of ?+1-10+2
- Answer choicesTagsAnswer choicesTags