3.1 Definition of Redox Reaction

1. The reaction in which oxidation and reduction co-occur is known as:

• Redox reaction

• Oxiduction reaction

• Both a and b

• None of the above

2. Oxidation refers to the:

• Gain of electrons

• Loss of electrons

• Loss of protons

• Gain of protons

3. Reduction refers to the:

• Gain of electrons

  
  

• Loss of electrons

  
  

• Loss of protons

  
  

• Gain of protons

  
  

4. The addition of oxygen from a compound is an example of ________?

• reduction

• oxidation

• dehydrogenation

  
  

• oxygenation

  
  

5. The addition of hydrogen from a compound is an example of ________?

• reduction

• oxidation

• dehydrogenation

  
  

• oxygenation

  
  

6. Identify the species that is oxidized:

Fe³⁺ + Al  →  Al³⁺ +  Fe

7. Identify the species being reduced in the following reaction:

3 Hg²⁺ + Fe (s) → 3 Hg₂ + 2 Fe³⁺

7. Identify the substance that is oxidized in the following reaction:

CuO(s) + H₂(g) → Cu(s) + H₂O(l)

Identify the substance reduced in the given reaction:
H₂S + Br₂ → 2HBr + S

10. What is an oxidation reaction? Identify:

(a) the substance oxidized, and (b) the substance reduced in the following reaction.

ZnO + C → Zn + CO