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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 8 April 2024, Shift 1, Chemistry Q64

Question 64 of 90 in this shift, Chemistry question 4 of 30, Section A.

Thiosulphate reacts differently with iodine and bromine in the reactions given below: 2S2O32−+I2→S4O62−+2I−2\mathrm{S_2O_3^{2-}}+\mathrm{I_2}\rightarrow\mathrm{S_4O_6^{2-}}+2\mathrm{I^-} S2O32−+5Br2+5H2O→2SO42−+4Br−+10H+\mathrm{S_2O_3^{2-}}+5\mathrm{Br_2}+5\mathrm{H_2O}\rightarrow2\mathrm{SO_4^{2-}}+4\mathrm{Br^-}+10\mathrm{H^+} Which of the following statement justifies the above dual behaviour of thiosulphate?
  1. (1)Bromine is a stronger oxidant than iodineOfficial answer
  2. (2)Bromine is a weaker oxidant than iodine
  3. (3)Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions
  4. (4)Bromine undergoes oxidation and iodine undergoes reduction in these reactions

Official answer

Option 1

NTA final key.

Chapter
Redox Reactions
Topic
Redox Reactions
Idea tested
Thiosulfate-Iodine Reaction Stoichiometry

Same idea in other shifts

Asked 2× in all
  1. 28 Jun 2022, Shift 1 · Q81A 2.0 g sample containing MnO2\mathrm{MnO_2} is treated with HCl liberating Cl2\mathrm{Cl_2}. The Cl2\mathrm{Cl_2} gas is passed into a…MediumNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.