O-LevelChemistryMetals & Reactivity5070/11 · Oct/Nov 2022 · Q251 Mark

Thiosulfate ions, S2O3²⁻, react with iodine, I2, in aqueous solution. 2S2O3²⁻(aq) + I2(aq) → 2I⁻(aq) + S4O6²⁻(aq) In this reaction, the S2O3²⁻ ions .....1...... electrons and are .....2....... Which words correctly complete gaps 1 and 2?

Again oxidised

Bgain reduced

Close oxidised

Dlose reduced

✓ Correct answer

C: lose oxidised

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2022 Paper 1 Variant 1, question 25.

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