In order to oxidise a mixture of 1 mole each of FeC 2 O 4 , Fe 2 ( C 2 O 4 ) 3 , FeSO 4 and Fe 2 ( SO 4 ) 3 in acidic medium, the number of moles of KMnO 4 required is :

Chemistry · Redox Reactions

JEE Main 2026 — 4 April, Morning Shift — Question 53

In order to oxidise a mixture of 1 mole each of $\mathrm{FeC}_{2} \mathrm{O}_{4}, \mathrm{Fe}_{2}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}, \mathrm{FeSO}_{4}$ and $\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}$ in acidic medium, the number of moles of $\mathrm{KMnO}_{4}$ required is :

Option A:
3
Option B:
2
Correct
Option C:
5
Option D:
7

Answer: B

Step-by-step solution

Meq of $\mathrm{KM}_{\mathrm{n}} \mathrm{O}_{4}=\mathrm{meq}$ of $\mathrm{FeC}_{2} \mathrm{O}_{4}+\mathrm{meq}$ of $\mathrm{Fe}_{2}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)+$ meq of $\mathrm{FeSO}_{4}$ moles $\times 5=1 \times 3+1 \times 6+1 \times 1$ moles $=\frac{10}{5}=2$

Answer key and solution verified before publishing.

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Exam: JEE Main 2026
Paper: 4 April, Morning Shift
Subject: Chemistry
Chapter: Redox Reactions
Topic: n-Factor, Redox Titrations, Self Indicator & Miscellaneous Cases