JEE Main 2024 Chemistry question

ChemistryRedox ReactionsJEE Main 2024

Thiosulphate reacts differently with iodine and bromine in the reaction given below: 2S₂O₃²⁻ + I₂ → S₄O₆²⁻ + 2I⁻ and S₂O₃²⁻ + 5Br₂ + 5H₂O → 2SO₄²⁻ + 4Br⁻ + 10H⁺. Which of the following statement justifies the above dual behaviour of thiosulphate?

Answer: (C)

Solution

Bromine, the stronger oxidant, takes thiosulphate all the way to sulphate, whereas iodine only oxidises it to tetrathionate.

Question ID VK-012336