Oxidation-Reduction Reactions

AP Chemistry· difficulty 3/5

Which is a redox reaction?

  • A

    CO₂ + H₂O → H₂CO₃

  • B

    NaCl + AgNO₃ → AgCl + NaNO₃

  • C

    HCl + NaOH → NaCl + H₂O

  • D

    Mg + 2 HCl → MgCl₂ + H₂

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Explanation

Mg goes from 0 to +2 (oxidation); H goes from +1 to 0 (reduction). Others are precipitation, neutralization, or addition — no oxidation-state change.

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