Which of these are oxidation-reduction reactions? I. 3H₂ + N₂ → 2NH₃ II. Cu₂O + C → 2Cu + CO III. Fe₂O₃ + 3CO → 2Fe + CO₂ IV. 2K + Br₂ → 2KBr A) I and III B) III and IV C) I and II D) I, II, and III E) I, II, III, and IV

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All the given reactions involve the transfer of electrons from one species to another, which is characteristic of oxidation-reduction (redox) reactions. In each reaction, at least one element undergoes oxidation (loses electrons) and at least one element undergoes reduction (gains electrons).

Which of These Are Oxidation-Reduction Reactions