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College Oxidation-Reduction Reactions Questions

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College Oxidation-Reduction Reactions
What is oxidation?
  1. Loss of electrons
  2. Loss of hydrogen
  3. Gain of hydrogen
  4. Gain of electrons
College Oxidation-Reduction Reactions
Which of the following represents the correct oxidation half-reaction for the following redox reaction?

Zn+H2O→ZnO+H2
  1. H2→2H++2e-
  2. 2H++2e-→H2
  3. Zn→Zn2++2e-
  4. Zn2++2e-→2Zn0
College Oxidation-Reduction Reactions
What is reduction?
  1. Gain of electrons
  2. Gain of hydrogen
  3. Loss of electrons
  4. Loss of hydrogen
College Oxidation-Reduction Reactions
Which of the following represents a redox reaction?
  1. 2AgClO3→2AgCl+3O2
  2. KOH+HCl→H2O+KCl
  3. Pb(NO3)2+2KCl→PbCl2+2KNO3
  4. LiCl→Li++Br-