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Eleventh Grade (Grade 11) Oxidation-Reduction Reactions Questions

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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 11 Oxidation-Reduction Reactions
What is the oxidation number of Nitrogen (N) in [math]HNO_3[/math]?
  1. +5
  2. +4
  3. +3
  4. +2
Grade 11 Oxidation-Reduction Reactions
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.
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]
Grade 11 Oxidation-Reduction Reactions
What is the oxidation number of Pt in [math][PtCl_6]^(2-)[/math]?
  1. +4
  2. +3
  3. +2
  4. +1
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