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- 1. Multiple ChoiceIn the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________ReducedSynthesizedOxidizedNone of the above - 2. Multiple ChoiceWhat is the oxidation number of Fe in FeO?+1-1+2-2
- 3. Multiple ChoiceWhat is oxidation number of Cr in Cr2O72-?-2+2+6+12
- 4. Multiple ChoiceWhat is oxidation number of P in K3PO4?+1+5-20
- 5. Multiple ChoiceWhat is oxidation number of O in O2 ?0-2+1+2
- 6. Multiple ChoiceWhich of the following elements does NOT have an oxidation number of +2?CaSrKBa
- 7. Multiple ChoiceIn the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?ZincHydrogenOxygenNone - 8. Multiple ChoiceAnother name for a "oxidation-reduction" reaction ischemical reactionneutralization reactionredox reactionnuclear reaction
- 9. Multiple ChoiceHow would you write the electrons in the reaction O2 --> O2-2 ?+2e- on the products+2e- on the reactants+e- on the products+e- on the reactants
- 10. Multiple ChoiceIs calcium oxidized or reduced in the following reaction?
2CaO--> 2Ca + O2OxidizedReduced - 11. Multiple ChoiceWhich of the following is the balanced half -reaction for the oxidation of Cu to Cu+2?Cu --> Cu+2Cu + 2 e- --> Cu+2Cu --> Cu+2 + 2 e-Cu - 2e- --> Cu+2
- 12. Multiple Choice
Which are examples of reduction?I and III and IIIII and IIII, II and III - 13. Multiple ChoiceWhich change does nitrogen undergo oxidation?ABCD
- 14. Multiple ChoiceWhat happens to Cr3+ ion when it is converted to CrO42–Oxidation number decreases and it undergo reductionOxidation number decreases and it undergo oxidationOxidation number increases and it undergo reductionOxidation number increases and it undergo oxidation
- 15. Multiple ChoiceReduction happens at theanodecathodesalt bridgevoltmeter
- 16. Multiple ChoiceOxidation happens at theanodecathodesalt bridgevoltmeter
- 17. Multiple ChoiceReactions in voltaic cells arespontaneous, redox reactionsnon-spontaneous, redox reactionsspontaneous, non-redox reactionsnon-spontaneous, non-redox reactions
- 18. Multiple ChoiceWhat reaction occurs at the anode?Ag+ + e- →AgAg → Ag+ + e-Ni2+ + 2e- → NiNi → Ni2+ + 2e-
- 19. Multiple ChoiceIn which direction does electricity flow in a voltaic cell (battery)?Electrons flow from the cathode to the anodeElectrons flow from left to rightElectrons flow from anode to cathodeElectrons flow from right to left
- 20. Multiple ChoiceWhich direction do the electrons flow in wire X and which metal is oxidized?ABCD
- 21. Multiple ChoiceWhich of the following half reactions correctly represents a reduction half reaction?Fe →Fe2+ + 2e-Pb4+ + 2e- →Pb2+2O-2 →O2 + 4e-Fe + 3e- →Fe3+
- 22. Multiple Choice
Which statement best describes how a salt bridge maintains electrical neutrality in the half-cells of an electrochemical cell?
It prevents the migration of electrons.
It prevents the reaction from occurring spontaneously.
It permits the migration of ions.
It allows for the reaction from occurring spontaneously.
- 23. Multiple Choice
When an electrochemical cell is operating, it is
approaching equilibrium
using external energy
undergoing oxidation, only
undergoing reduction, only
- 24. Multiple Choice
What is the oxidation number of carbon in H2CO3(aq)?
4-
2+
2-
4+
- 25. Multiple Choice
What is the oxidation state for a lead atom?
2+
4+
0
2-
- Answer choicesTagsAnswer choicesTags