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Redox Reactions (Grades 11-12)

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Redox 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]
What is one characteristic feature of an oxidizing agent?
  1. It undergoes reduction
  2. Causes reduction
  3. Donates electron
  4. It itself undergoes oxidation
Which of the following represents a redox reaction?
  1. [math]2AgClO_3 rarr 2AgCl + 3O_2[/math]
  2. [math]KOH + HCl rarr H_2O + KCl[/math]
  3. [math]Pb(NO_3)_2 + 2KCl rarr PbCl_2 + 2KNO_3[/math]
  4. [math]LiCl rarr Li^+ + Br^-[/math]
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]
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]
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]
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]
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]
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]
          Al +           [math]Zn^{2+} rarr[/math]           [math]Al^{3+}[/math] +           Zn

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