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Oxidation-Reduction Reactions Questions - All Grades

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Grade 10 Oxidation-Reduction Reactions
Which of the following always occurs in an oxidation-reduction reaction?
  1. a reactant loses a proton
  2. a reactant loses two neutrons
  3. a reactant gains sulfur
  4. a reactant gains protons and neutrons
  5. one reactant gains electrons, and the other reactant(s) lose an equal number of electrons
College Oxidation-Reduction Reactions
What is oxidation?
  1. Loss of electrons
  2. Loss of hydrogen
  3. Gain of hydrogen
  4. Gain of electrons
Grade 12 Oxidation-Reduction Reactions
College Oxidation-Reduction Reactions
What is reduction?
  1. Gain of electrons
  2. Gain of hydrogen
  3. Loss of electrons
  4. Loss of hydrogen
Grade 11 Oxidation-Reduction Reactions
Consider the following redox reaction

[math]H_2C_2O_4 (aq) + MnO_4^(-) (aq) rarr CO_2(g) + Mn^(2+) (aq) [/math]

What is the reduction half reaction for this redox reaction?
  1. [math](Mn)^(7+) (aq) rarr Mn^(2+) (aq) [/math]
  2. [math]H_2C_2O_4 (aq) rarr CO_2(g)[/math]
  3. [math](MnO_4)^(-) (aq) + 8H^(+) (aq) rarr Mn^(2+) (aq) + 4H_2O (l)[/math]
  4. [math]H_2C_2O_4 (aq) rarr 2CO_2 (g) + 2H^(+) (aq)[/math]
Grade 11 Oxidation-Reduction Reactions
Identify the reducing agent in the following reaction:

[math]I_2(aq) + 2S_2O_3^(2-) (aq) rarr S_4O_6^(2-) (aq) + 2I^(-) (aq)[/math]
  1. [math](S_2O_3)^(2-)[/math]
  2. [math]I_2[/math]
  3. [math](S_4O_6)^(2-)[/math]
  4. [math]I^(-)[/math]
Grade 11 Oxidation-Reduction Reactions
Which of the following chemical equations represents a redox reaction?
  1. [math]CH_3COOH + NaOH -> CH_3COONa + H_2O[/math]
  2. [math]Cl^(-) + Ag^(+) ->AgCl darr[/math][math][/math]
  3. [math]5Fe^(2+) + MnO_4^(1-) + 8H_3O^+ rArr6Fe^(3+) + Mn^(2+) + 12H_2O[/math]
  4. [math]HCl + NaOH -> NaCl + H_2O[/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
Grade 12 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. reductant
Grade 11 Oxidation-Reduction Reactions
Consider the following redox reaction:

[math]CH_4 (g) + O_2(g) rarr CO_2(g) + 2H_2O (l)[/math]

What is the change in the oxidation number of carbon in this reaction?
  1. It increases from -4 to +4
  2. It decreases from +4 to 0
  3. It increases from +4 to -3
  4. It decreases from +4 to -2
Grade 11 Oxidation-Reduction Reactions
What is the sum of the oxidation states in an ionic compound?
  1. It equals the charge of the cation
  2. It equals the charge of the anion
  3. It is equivalent to the magnitude of the ion with the higher charge
  4. It equals zero
Grade 11 Oxidation-Reduction Reactions
What is one characteristic feature of an oxidizing agent?
  1. It undergoes reduction
  2. Causes reduction
  3. Donates electron
  4. It itself undergoes oxidation
Grade 11 Oxidation-Reduction Reactions
Identify the oxidant in the following 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
Identify the oxidant in the following 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
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