During an analytical redox titration used to determine the concentration of active ingredient in commercial bleach, iodine (I2\text{I}_2I2) reacts with sodium thiosulfate (Na2S2O3\text{Na}_2\text{S}_2\text{O}_3Na2S2O3) according to the following equation:
I2(aq)+2Na2S2O3(aq)→2NaI(aq)+Na2S4O6(aq) \text{I}_2(\text{aq}) + 2\text{Na}_2\text{S}_2\text{O}_3(\text{aq}) \rightarrow 2\text{NaI}(\text{aq}) + \text{Na}_2\text{S}_4\text{O}_6(\text{aq}) I2(aq)+2Na2S2O3(aq)→2NaI(aq)+Na2S4O6(aq)Which statement correctly describes the role and behavior of iodine (I2\text{I}_2I2) in this reaction?
It acts as the reducing agent because it reduces sulfur and is itself oxidised.
It acts as the reducing agent because it oxidises sulfur and is itself reduced.
It acts as the oxidising agent because it reduces sulfur and is itself oxidised.
It acts as the oxidising agent because it oxidises sulfur and is itself reduced.
Practise OCR GCSE Chemistry Types of chemical reactions with exam-style questions for Foundation and Higher tier. 58 questions, matched to the OCR GCSE Chemistry (J248) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.