Learn

Friday, 9 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 topic in other shifts

All Redox Reactions questions
  1. 2 Apr 2026, Shift 1 · Q61Which of the following sets includes all the species that will change the orange colour of K2Cr2O7\mathrm{K_2Cr_2O_7} in acidic medium ?MediumSingle correct
  2. 4 Apr 2026, Shift 1 · Q56In order to oxidise a mixture of 11 mole each of FeC2O4\mathrm{FeC_2O_4}, Fe2(C2O4)3\mathrm{Fe_2(C_2O_4)_3}, FeSO4\mathrm{FeSO_4} and…MediumSingle correct
  3. 6 Apr 2026, Shift 2 · Q73500 mL of 0.2 M MnO4−\mathrm{MnO_4^-} solution in basic medium when mixed with 500 mL of 1.5 M KI solution, oxidises iodide ions to liberate…MediumNumerical value
  4. 6 Apr 2024, Shift 2 · Q64Match List - I with List - II. List - I (Reaction) (A) N2(g)+O2(g)→2NO(g)\mathrm{N_{2(g)}+O_{2(g)}\rightarrow 2NO_{(g)}} (B)…EasyMatch the list
  5. 9 Apr 2024, Shift 1 · Q65Given below are two statements : Statement (I) : The oxidation state of an element in a particular compound is the charge acquired by its…MediumTwo statements
  6. 29 Jan 2024, Shift 1 · Q63Chlorine undergoes disproportionation in alkaline medium as shown below :…EasySingle correct

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 42 of the 174 JEE Main shifts held from 2017 to 2026.