JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyConceptual

JEE Main 27 July 2022, Shift 1, Chemistry Q88

Question 88 of 90 in this shift, Chemistry question 28 of 30, Section B.

In the titration of

\mathrm{KMnO_4}

and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is _____

Official answer

NTA final key.

Chapter: Redox Reactions
Topic: Redox Reactions
Idea tested: Oxidation Number Assignment

Same idea in other shifts

Asked 9× in all

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27 Aug 2021, Shift 1 · Q39In polythionic acid, $\mathrm{H_2S_xO_6}$ ( $x$ = 3 to 5) the oxidation state(s) of sulphur is/are :MediumSingle correct
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18 Mar 2021, Shift 2 · Q38The oxidation states of nitrogen in NO, $\mathrm{NO_2}$ , $\mathrm{N_2O}$ and $\mathrm{NO_3^-}$ are in the order of :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.