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Saturday, 31 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 27 August 2021, Shift 1, Chemistry Q55

Question 55 of 90 in this shift, Chemistry question 25 of 30, Section B.

When 10 mL of an aqueous solution of KMnO4\mathrm{KMnO_4} was titrated in acidic medium, equal volume of 0.1 M of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of KMnO4\mathrm{KMnO_4} in grams per litre is __________ ×10−2\times 10^{-2}. (Nearest integer) [Atomic mass of K = 39, Mn = 55, O = 16]

Official answer

316

NTA final key.

Chapter
Some Basic Concepts of Chemistry
Topic
Redox Reactions
Idea tested
Mohr's Salt Redox Titrations

Same idea in other shifts

Asked 3× in all
  1. 28 Jun 2022, Shift 2 · Q900.01 M KMnO4\mathrm{KMnO_4} solution was added to 20.0 mL of 0.05 M Mohr’s salt solution through a burette. The initial reading of 50 mL…MediumNumerical value
  2. 25 Jul 2021, Shift 1 · Q51When 10 mL of an aqueous solution of Fe2+\mathrm{Fe^{2+}} ions was titrated in the presence of dil H2SO4\mathrm{H_2SO_4} using diphenylamine…MediumNumerical value

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.