Redox Reactions JEE Main PYQs, 2020 to 2025

Redox Reactions has 65 questions in JEE Main papers from 2020 to 2025, about 11 per year across all shifts. The most asked topic is Redox in Acidic and Basic Medium (14 questions), followed by Applications of Redox (13) and Oxidation Number (12).

Updated 26 Sep 2026

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65Total PYQs

6Years covered

8Topics

2025 Jan S2Latest paper

Redox Reactions questions per year

Year	Questions
2025	1
2024	14
2023	17
2022	11
2021	15
2020	7

Topic-wise weightage

Topic	Questions	Share of chapter	Last asked
Redox in Acidic and Basic Medium	14	22%	2024
Applications of Redox	13	20%	2024
Oxidation Number	12	18%	2024
Oxidation States	11	17%	2024
Types of Redox Reactions	7	11%	2025
Oxidation and Reduction	4	6%	2024
Balancing Redox Equations	3	5%	2023
Balancing Redox Reactions	1	1%	2023

Sample questions from recent papers

JEE Main 2025 · 22 Jan · Shift 2 · Types of Redox Reactions

The species which does not undergo disproportionation reaction is :

(A) $\mathrm{ClO}_4^{-}$
(B) $\mathrm{ClO}_3^{-}$
(C) $\mathrm{ClO}^{-}$
(D) $\mathrm{ClO}_2^{-}$

Answer: (A)

Step-by-step solution

JEE Main 2024 · 9 Apr · Shift 1 · Oxidation Number

Given below are two statements :

Statement (I) : The oxidation state of an element in a particular compound is the charge acquired by its atom on the basis of electron gain enthalpy consideration from other atoms in the molecule.

Statement (II) : $\mathrm{p} \pi-\mathrm{p} \pi$ bond formation is more prevalent in second period elements over other periods.

In the light of the above statements, choose the most appropriate answer from the options given below :

(A)Statement I is correct but Statement II is incorrect
(B)Both Statement I and Statement II are correct
(C)Statement I is incorrect but Statement II is correct
(D)Both Statement I and Statement II are incorrect

Answer: (C)

Step-by-step solution

JEE Main 2024 · 4 Apr · Shift 1 · Applications of Redox

Only $2 \mathrm{~mL}$ of $\mathrm{KMnO}_4$ solution of unknown molarity is required to reach the end point of a titration of $20 \mathrm{~mL}$ of oxalic acid $(2 \mathrm{M})$ in acidic medium. The molarity of $\mathrm{KMnO}_4$ solution should be ________ M.

Answer: 8

Step-by-step solution

JEE Main 2024 · 1 Feb · Shift 1 · Redox in Acidic and Basic Medium

In acidic medium,

\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7

shows oxidising action as represented in the half reaction:

\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}+\mathrm{XH}^{+}+\mathrm{Ye}^{\ominus} \rightarrow 2 \mathrm{~A}+\mathrm{ZH}_2 \mathrm{O}

\mathrm{X}, \mathrm{Y}, \mathrm{Z}

and

\mathrm{A}

are respectively are :

(A) $14,7,6$ and $\mathrm{Cr}^{3+}$
(B) $14,6,7$ and $\mathrm{Cr}^{3+}$
(C) $8,4,6$ and $\mathrm{Cr}_2 \mathrm{O}_3$
(D) $8,6,4$ and $\mathrm{Cr}_2 \mathrm{O}_3$

Answer: (B)

Step-by-step solution

JEE Main 2024 · 1 Feb · Shift 1 · Oxidation States

The lowest oxidation number of an atom in a compound

\mathrm{A}_2 \mathrm{B}

is -2 . The number of electrons in its valence shell is _______.

Answer: 6

Step-by-step solution

JEE Main 2024 · 27 Jan · Shift 2 · Oxidation and Reduction

Which of the following cannot function as an oxidising agent?

(A) $\mathrm{SO}_4^{2-}$
(B) $\mathrm{MnO}_4^{-}$
(C) $\mathrm{N}^{3-}$
(D) $\mathrm{BrO}_3^{-}$

Answer: (C)

Step-by-step solution

All 65 questions are in the free PDF above, grouped by topic.

Frequently asked

How many questions come from Redox Reactions in JEE Main?

65 questions from 2020 to 2025, about 11 per year. In 2025 it had 1.

Which Redox Reactions topics are most important for JEE Main?

By past papers: Redox in Acidic and Basic Medium (22%), Applications of Redox (20%) and Oxidation Number (18%) of all Redox Reactions questions.

Is the Redox Reactions PYQ PDF free?

Yes. The PDF, the answer key and every step-by-step solution on PrepWiser are free, with no login needed to practise.

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JEE Main PYQs by year: 2025 · 2024 · 2023 · 2022 · 2021 · 2020

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