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JEE Main 20248 AprilMorning Shift
Exam
JEE Main
Year
2024
Date
8 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Redox Reactions

JEE Main 2024 · 8 April · Morning Shift · Chemistry · Redox Reactions

Thiosulphate reacts differently with iodine and bromine in the...

Thiosulphate reacts differently with iodine and bromine in the reactions given below: (2 S2O32−+I2→S4O62−+2I−S2O32−+5Br2+5H2O→2SO42−+4Br−+10H+\begin{aligned} & 2 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{I}_2 \rightarrow \mathrm{S}_4 \mathrm{O}_6^{2-}+2 \mathrm{I}^{-} \\ & \mathrm{S}_2 \mathrm{O}_3^{2-}+5 \mathrm{Br}_2+5 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{SO}_4^{2-}+4 \mathrm{Br}^{-}+10 \mathrm{H}^{+} \end{aligned}) Which of the following statement justifies the above dual behaviour of thiosulphate?

Options

  1. ABromine is a stronger oxidant than iodine
  2. BThiosulphate undergoes oxidation by bromine and reduction by iodine in these reaction
  3. CBromine is a weaker oxidant than iodine
  4. DBromine undergoes oxidation and iodine undergoes reduction in these reactions

Correct answer

A. Bromine is a stronger oxidant than iodine

Step-by-step solution

In the reaction of S2O32−\mathrm{S}_2 \mathrm{O}_3{ }^{2-} with I2\mathrm{I}_2, oxidation state of sulphur changes to +2 to +2.5 In the reaction of S2O32−\mathrm{S}_2 \mathrm{O}_3{ }^{2-} with Br2\mathrm{Br}_2, oxidation state of sulphur changes from +2 to +6 . ∴\therefore Both I2\mathrm{I}_2 and Br2\mathrm{Br}_2 are oxidant (oxidising agent)andBr2and \mathrm{Br}_2 is stronger oxidant than I2\mathrm{I}_2.
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