JEE Main 2021 · ChemistryNumerical answerNumerical valueHardCalculation

JEE Main 26 February 2021, Shift 2, Chemistry Q59

Question 59 of 90 in this shift, Chemistry question 29 of 30, Section B.

In mildly alkaline medium, thiosulphate ion is oxidized by

\mathrm{MnO_4^-}

to "A". The oxidation state of sulphur in "A" is __________.

Official answer

NTA final key.

Chapter: Redox Reactions
Topic: Redox Reactions
Idea tested: Permanganate n-Factor Across Media

Same idea in other shifts

Asked 6× in all

6 Apr 2023, Shift 2 · Q69During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the…MediumSingle correct
10 Apr 2023, Shift 2 · Q90In alkaline medium, the reduction of permanganate anion involves a gain of ____________ electrons.EasyNumerical value
13 Apr 2023, Shift 1 · Q81 $\mathrm{KMnO_4}$ is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute $\mathrm{H_2SO_4}$ . Number of water…EasyNumerical value
15 Apr 2023, Shift 1 · Q88The total change in the oxidation state of manganese involved in the reaction of $\mathrm{KMnO_4}$ and potassium iodide in the acidic…EasyNumerical value
26 Jul 2022, Shift 1 · Q69The dark purple colour of $\mathrm{KMnO_4}$ disappears in the titration with oxalic acid in acidic medium. The overall change in the…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.