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Oxidation-Reduction Reactions Questions - All Grades

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Grade 12 Oxidation-Reduction Reactions
The oxidation number of H in [math]AlH_3[/math] is                .
  1. [math]+1[/math]
  2. [math]-1[/math]
  3. [math]+3[/math]
  4. [math]0[/math]
Grade 11 Oxidation-Reduction Reactions
What is the oxidation number of V in [math](V_2O_7) ^(4-)[/math]?
  1. [math]+5[/math]
  2. [math]+3[/math]
  3. [math]+2[/math]
  4. [math]+1[/math]
Grade 11 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
Which species oxidizes another in the following redox reaction?
[math]3H_3AsO_3(aq) + BrO_3^(-) (aq) rarr Br^(-) (aq) + 3H_3AsO_4(aq)[/math]?
  1. [math]BrO_3^(-) (aq)[/math]
  2. [math]H_3AsO_3[/math]
  3. [math]Br^(_) (aq)[/math]
  4. [math]H_3AsO_4[/math]
Grade 11 Oxidation-Reduction Reactions
Grade 11 Oxidation-Reduction Reactions
Grade 12 Oxidation-Reduction Reactions
The oxidation number of P is +3 in which of the following compounds?
  1. [math]H_3PO_2[/math]
  2. [math]H_3PO_3[/math]
  3. [math]H_3PO_4[/math]
  4. [math]H_4P_2O_7[/math]
Grade 11 Oxidation-Reduction Reactions
Which species oxidizes another in the following redox reaction?

[math]C_4H_4O_6^(2-) (aq) + ClO_3^(-) (aq) rarr CO_3^(2-) (aq) + Cl^(-) (aq) [/math]?
  1. [math](ClO_3)^(-)[/math]
  2. [math](C_6H_4O_6)^(2-)[/math]
  3. [math](CO_3)^(2-)[/math]
  4. [math]Cl^(_)[/math]
Grade 11 Oxidation-Reduction Reactions
Consider the following redox reaction:

[math](VO)^(2+) (aq) rarr V^(3+) (aq) [/math][math][/math]

What is the change in the oxidation number of vanadium in this reaction?
  1. It decreases from +4 to +3.
  2. It decreases from +4 to -4.
  3. It increases from +4 to +2.
  4. It decreases from +4 to -3.
Grade 12 Oxidation-Reduction Reactions
A substance that goes to a higher oxidation number is
  1. an oxidizing agent.
  2. a substance that reduces.
  3. a reducing agent.
  4. an oxidant.
Grade 12 Oxidation-Reduction Reactions
The oxidation number of oxygen in an [math]O_2^[2-][/math] ion is                .
  1. [math]-2[/math]
  2. [math]+1[/math]
  3. [math]-1[/math]
  4. [math]+2[/math]
Grade 12 Oxidation-Reduction Reactions
College Oxidation-Reduction Reactions
What is oxidation?
  1. Loss of electrons
  2. Loss of hydrogen
  3. Gain of hydrogen
  4. Gain of electrons
Grade 11 Oxidation-Reduction Reactions
Grade 12 Oxidation-Reduction Reactions
A substance that gains electron(s) is
  1. an oxidizing agent.
  2. a reducing agent.
  3. a substance that oxidizes.
  4. a reductant.
Grade 11 Oxidation-Reduction Reactions
Which of the following half-reactions involves oxidation?
  1. Fe in [math]Fe(OH)_2 rarr Fe(OH)_3[/math]
  2. V in [math]VO^(2+) (aq) rarr V^(3+) (aq) [/math]
  3. Cl in [math]OCl^(-) (aq) rarr Cl^(-) (aq) [/math]
College Oxidation-Reduction Reactions
Which of the following represents the correct oxidation half-reaction for the following redox reaction?

[math]Zn + H_2O rarr ZnO + H_2[/math]
  1. [math]H_2 rarr 2H^+ + 2e^-[/math]
  2. [math]2H^+ + 2e^{-} rarr H_2[/math]
  3. [math]Zn rarr Zn^{2+} + 2e^-[/math]
  4. [math]Zn^{2+} + 2e^{-} rarr 2Zn^0[/math]
Grade 11 Oxidation-Reduction Reactions
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