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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 AlH3 is                .
  1. +1
  2. -1
  3. +3
  4. 0
Grade 11 Oxidation-Reduction Reactions
What is the oxidation number of V in (V2O7)4-?
  1. +5
  2. +3
  3. +2
  4. +1
Grade 11 Oxidation-Reduction Reactions
What is the oxidation number of hydrogen in a molecule of hydrogen?
  1. -1
  2. +1
  3. 0
  4. +2
Grade 11 Oxidation-Reduction Reactions
What is the oxidation number of carbon in potassium oxalate?
  1. +3
  2. -1
  3. -2
  4. +2
Grade 12 Oxidation-Reduction Reactions
The oxidation number of P is +3 in which of the following compounds?
  1. H3PO2
  2. H3PO3
  3. H3PO4
  4. H4P2O7
Grade 11 Oxidation-Reduction Reactions
What oxidation states could possibly exist for iron in a compound?
  1. +3, +2
  2. +3, +1
  3. +3, +5
  4. +3, +4
Grade 11 Oxidation-Reduction Reactions
What is the oxidation number of hydrogen in one molecule of water?
  1. +2
  2. -2
  3. +1
  4. 0
Grade 11 Oxidation-Reduction Reactions
Consider the following redox reaction:

(VO)2+(aq)→V3+(aq)

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.
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
What is the oxidation number of Nitrogen (N) in HNO3?
  1. +5
  2. +4
  3. +3
  4. +2
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
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 Fe(OH)2→Fe(OH)3
  2. V in VO2+(aq)→V3+(aq)
  3. Cl in OCl-(aq)→Cl-(aq)
Grade 11 Oxidation-Reduction Reactions
What is the oxidation number of Pt in [PtCl6]2-?
  1. +4
  2. +3
  3. +2
  4. +1
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