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Tenth Grade (Grade 10) Oxidation-Reduction Reactions Questions

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Grade 10 Oxidation-Reduction Reactions
Which of the following always occurs in an oxidation-reduction reaction?
  1. a reactant loses a proton
  2. a reactant loses two neutrons
  3. a reactant gains sulfur
  4. a reactant gains protons and neutrons
  5. one reactant gains electrons, and the other reactant(s) lose an equal number of electrons
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