Which one of the following statements regarding oxidation and reduction reactions is NOT correct?

  1. A. If a substance loses hydrogen during reaction, it is reduced
  2. B. If a substance loses oxygen during reaction, it is reduced
  3. C. If a substance gains hydrogen during reaction, it is reduced
  4. D. If a substance gains oxygen during reaction, it is oxidized

Correct Answer: A. If a substance loses hydrogen during reaction, it is reduced

Explanation

Losing hydrogen during a chemical reaction represents oxidation, not reduction. Gaining hydrogen is reduction.

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