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CAPE Chemistry Unit 1 · 2017 · Paper 1 · Question 45

Two reactions are given: I₂(aq) + 2S₂O₃²⁻(aq) → 2I⁻(aq) + S₄O₆²⁻(aq) and 4Cl₂(aq) + S₂O₃²⁻(aq) + 5H₂O(l) → 8Cl⁻(aq) + 2SO₄²⁻(aq) + 10H⁺(aq).

What deduction can be made from the following reactions of iodine and chlorine with sodium thiosulfate?

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