State the relationship between oxidation and oxidizing agent in a redox reaction. Give an example of a redox reaction showing the relationship between oxidation and oxidizing agent.

a) Oxidation is the loss of electrons; the oxidizing agent gains electrons. Example: 2Fe + 3Cl2 → 2FeCl3

b) Oxidation is the gain of electrons; the oxidizing agent loses electrons. Example: Cu + 2Ag⁺ → Cu²⁺ + 2Ag

c) Reduction is the loss of electrons; the oxidizing agent gains electrons. Example: Zn + Cu²⁺ → Zn²⁺ + Cu

d) Reduction is the gain of electrons; the oxidizing agent loses electrons. Example: H₂ + Cl₂ → 2HCl