JEE Main 2022 · ChemistryMultiple choiceSingle correctMediumRecall

JEE Main 27 July 2022, Shift 2, Chemistry Q69

Question 69 of 90 in this shift, Chemistry question 9 of 30, Section A.

In neutral or alkaline solution,

\mathrm{MnO_4^-}

oxidises thiosulphate to :

(1) $\mathrm{S_2O_7^{2-}}$
(2) $\mathrm{S_2O_8^{2-}}$
(3) $\mathrm{SO_3^{2-}}$
(4) $\mathrm{SO_4^{2-}}$ Official answer

Official answer

Option 4

NTA final key.

Chapter: The d- and f-Block Elements
Topic: d-Block Elements
Idea tested: Specific KMnO4 Oxidations in Neutral/Alkaline Medium

Same idea in other shifts

Asked 4× in all

29 Jan 2024, Shift 1 · Q68In alkaline medium, $\mathrm{MnO_4^-}$ oxidises $\mathrm{I^-}$ toMediumSingle correct
27 Jul 2022, Shift 2 · Q87The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is…MediumNumerical value
29 Jul 2022, Shift 1 · Q70In neutral or faintly alkaline medium, $\mathrm{KMnO_4}$ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to…MediumSingle 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.