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Chemistry · May / June 2026 · Paper 12 · Question 16

5070Redox

Iodine, I2, reacts with thiosulfate ions, S2O3^2–. I2(aq) + 2S2O3^2–(aq) → 2I–(aq) + S4O6^2–(aq) Which row is correct?

  1. Abrown | a reducing agent
  2. Bbrown | an oxidising agent
  3. Ccolourless | a reducing agent
  4. Dcolourless | an oxidising agent

As printed in the paper

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Correct answer: B. brown | an oxidising agent

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