CAPE Chemistry Unit 1 · 2015 · Paper 1 · Question 45

What deduction can be made from the following reactions of iodine and chlorine with sodium thiosulfate? I₂(aq) + 2S₂O₃²⁻(aq) → 2I⁻(aq) + S₄O₆²⁻(aq) 4Cl₂(aq) + S₂O₃²⁻(aq) + 5H₂O(l) → 8Cl⁻(aq) + 2SO₄²⁻(aq) + 10H⁺(aq)