JEE Main 2021ChemistryGeneral Organic ChemistryMediumNumerical

JEE Main 2021 — General Organic Chemistry Question with Solution

JEE Main 2021 (27 Aug Shift 1)

Question

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

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Show full solutionCorrect answer: 316
Correct answer
316

Step-by-step explanation

MnO4-vf=5+Fe2+⟶vf=1Mn2++Fe3+

Mili equ. of MnO4=- mili equ. of Fe2+

5[M×10]=1[0.1×10]

M=0.15=0.02 mole  Lit 

Strength of KMnO4=0.02×158gramLit=3.16 g/L=316×10-2 g/L

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About this question

This is a previous-year question from JEE Main 2021, covering the General Organic Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.