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N5 Chemistry 2022 paper 1, question 20
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The reactions occurring at each electrode are:

Beaker A: Br2(ℓ) + 2e− → 2Br−(aq)

Beaker B: SO32− (aq) + H2O(ℓ) → SO42− (aq) + 2H+ (aq) + 2e−

Which of the following equations is the overall redox reaction in the cell?

  1. Br2(ℓ) + SO32− (aq) + H2O(ℓ) + 2e− → 2Br− (aq) + SO42− (aq) + 2H+ (aq) + 2e−
  2. 2Br− (aq) + SO42− (aq) + 2H+ (aq) → Br2(ℓ) + SO32− (aq) + H2O(ℓ)
  3. Br2(ℓ) + SO32− (aq) + H2O(ℓ) → 2Br− (aq) + SO42− (aq) + 2H+ (aq)
  4. 2Br− (aq) + SO42− (aq) → Br2(ℓ) + SO32− (aq)

You may wish to use the data booklet to help you.

1 mark