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Redox Reactions (Grades 11-12)

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Redox Reactions

Which chemical equation shows 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. It causes reduction.
  3. It donates an 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]
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]
Which species reduces another in the following redox 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]
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]
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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