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Topic 11: Redox and electrochemistry
8. Oxidation and Reduction: Recalling definitions and facts
1. Oxidation in a redox reaction involves a
1) Gain of protons 3) Gain of electrons
2) Loss of protons 4) Loss of electrons
2. In an oxidation-reduction chemical reactions, reduction is a
1) Gain of protons 3) Gain of electrons
2) Loss of protons 4) Loss of electrons
3. The oxidation number of oxidized substances in redox reactions always
1) Decreases 2) Increases 3) Remains the same
4. In re dox chemical reactions, the oxidation number of a reduced species always
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1) Increases 2) Decreases 3) Remains the same
5. The oxidation number of a reducing agent in a redox reaction always
1) Increases 2) Decreases 3) Remains the same
6. A reduced substance in oxidation and reduction reactions
1) Gains electrons and have a decrease in oxidation number
2) Gains electrons and have an increase in oxidation number
3) Loses electrons and have decreases in oxidation number
4) Loses electrons and have an increase in oxidation number
7. Which is true of a reducing agent in oxidation-reduction reactions?
1) A reducing agent loses electrons, and is oxidized
2) A reducing agent loses electrons, and is reduced
3) A reducing agent gains electrons, and is oxidized
4) A reducing agent gains electrons, and is reduced
8. Oxidizing agent is a species in a redox reaction that is
1) Reduced, because it has lost electrons
2) Reduced, because it has gained electrons
3) Oxidized, because it has lost electrons
4) Oxidized, because it has gained electrons
9. Oxidation and reduction:
1. Which change in oxidation number represents reduction?
1) -4 to +1 3) -1 to -2
2) -1 to +2 4) -3 to -2
2. Which change in oxidation number represents reduction?
1) +1 ----- > +2 3) +2 -------- > +4
2) 0 ------- > -1 4) -1 --------- > 0
3. Which of the following oxidation number change represents oxidation?
1) 0 to +1 3) 0 to -1
2) -2 to -3 4) +1 to 0
4. Which change in oxidation number represents oxidation?
1) 0 to -1 3) -2 to -1
2) 0 to -2 4) -2 to -3
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 321
Topic 11: Redox and electrochemistry
8. Oxidation and Reduction: Recalling definitions and facts
1. Oxidation in a redox reaction involves a
1) Gain of protons 3) Gain of electrons
2) Loss of protons 4) Loss of electrons
2. In an oxidation-reduction chemical reactions, reduction is a
1) Gain of protons 3) Gain of electrons
2) Loss of protons 4) Loss of electrons
3. The oxidation number of oxidized substances in redox reactions always
1) Decreases 2) Increases 3) Remains the same
4. In re dox chemical reactions, the oxidation number of a reduced species always
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Teacher Preview Copy
1) Increases 2) Decreases 3) Remains the same
5. The oxidation number of a reducing agent in a redox reaction always
1) Increases 2) Decreases 3) Remains the same
6. A reduced substance in oxidation and reduction reactions
1) Gains electrons and have a decrease in oxidation number
2) Gains electrons and have an increase in oxidation number
3) Loses electrons and have decreases in oxidation number
4) Loses electrons and have an increase in oxidation number
7. Which is true of a reducing agent in oxidation-reduction reactions?
1) A reducing agent loses electrons, and is oxidized
2) A reducing agent loses electrons, and is reduced
3) A reducing agent gains electrons, and is oxidized
4) A reducing agent gains electrons, and is reduced
8. Oxidizing agent is a species in a redox reaction that is
1) Reduced, because it has lost electrons
2) Reduced, because it has gained electrons
3) Oxidized, because it has lost electrons
4) Oxidized, because it has gained electrons
9. Oxidation and reduction:
1. Which change in oxidation number represents reduction?
1) -4 to +1 3) -1 to -2
2) -1 to +2 4) -3 to -2
2. Which change in oxidation number represents reduction?
1) +1 ----- > +2 3) +2 -------- > +4
2) 0 ------- > -1 4) -1 --------- > 0
3. Which of the following oxidation number change represents oxidation?
1) 0 to +1 3) 0 to -1
2) -2 to -3 4) +1 to 0
4. Which change in oxidation number represents oxidation?
1) 0 to -1 3) -2 to -1
2) 0 to -2 4) -2 to -3
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 321
