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Saturday, 31 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 2 April 2026, Shift 1, Chemistry Q61

Question 61 of 75 in this shift, Chemistry question 11 of 25, Section A.

Which of the following sets includes all the species that will change the orange colour of K2Cr2O7\mathrm{K_2Cr_2O_7} in acidic medium ?
  1. (1)Fe2+,Sn2+,I−,S2−\mathrm{Fe^{2+}, Sn^{2+}, I^-, S^{2-}}Official answer
  2. (2)S2−,Fe3+,I−,C2O42−\mathrm{S^{2-}, Fe^{3+}, I^-, C_2O_4^{2-}}
  3. (3)Fe2+,NO2−,SO2,Sn4+\mathrm{Fe^{2+}, NO_2^-, SO_2, Sn^{4+}}
  4. (4)Fe3+,SO42−,S2−,Sn4+\mathrm{Fe^{3+}, SO_4^{2-}, S^{2-}, Sn^{4+}}

Official answer

Option 1

NTA final key.

Chapter
Redox Reactions
Topic
Redox Reactions
Idea tested
Identifying Redox Agents

Same idea in other shifts

Asked 3× in all
  1. 6 Apr 2023, Shift 1 · Q65Which of the following options are correct for the reaction…MediumOther
  2. 9 Jan 2020, Shift 1 · Q35The compound that cannot act both as oxidising and reducing agent is :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 108 of the 174 JEE Main shifts held from 2017 to 2026.