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Twelfth Grade (Grade 12) Oxidation-Reduction Reactions Questions

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Grade 12 Oxidation-Reduction Reactions
The oxidation number of I in HOI is                .
  1. -1
  2. 0
  3. -2
  4. +1
Grade 12 Oxidation-Reduction Reactions
Based on the unbalanced reaction below,

CrO2-4(aq)→Cr(OH)-4(aq)

Chromium undergoes which of the following processes?
  1. an oxidation
  2. a redox reaction
  3. a reduction
  4. an electron transfer equation
Grade 12 Oxidation-Reduction Reactions
Which of the following properties qualitatively describes the ability of an atom to attract electrons?
  1. Ionization potential
  2. Electron affinity
  3. Electronegativity
  4. Valence
Grade 12 Oxidation-Reduction Reactions
The oxidation number of Cl in KClO3 is                .
  1. -1
  2. -5
  3. +1
  4. +5
Grade 12 Oxidation-Reduction Reactions
The oxidation number of H in AlH3 is                .
  1. +1
  2. -1
  3. +3
  4. 0
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 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.
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 12 Oxidation-Reduction Reactions
What is the oxidation state of Oxygen (O) in OF2?
  1. +4
  2. +2
  3. -1
  4. -2