Redox Reactions — JEE Main Previous Year Questions

How many JEE Main questions come from Redox Reactions?

Redox Reactions has contributed 70 questions to Joint Entrance Examination (Main) papers between 2016 and 2026 — an average of about 7 questions a year. That count is measured from EByAi’s bank of 55,289 JEE Main questions, not estimated from a syllabus. Every one of the 70 questions carries a written, step-by-step solution, and each is tagged to Redox Reactions within Chemistry, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample Redox Reactions questions from real JEE Main papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 70 Redox Reactions questions (with full written solutions) are available in practice.

1. Question 1 · JEE Main 2025

   The species which does not undergo disproportionation reaction is :
   1. (A)${\mathrm{ClO}}_4^{-}$
   2. (B)${\mathrm{ClO}}_3^{-}$
   3. (C)${\mathrm{ClO}}^{-}$
   4. (D)${\mathrm{ClO}}_2^{-}$
   Show answerAnswer

   Answer: (A) ${\mathrm{ClO}}_4^{-}$

2. Question 2 · JEE Main 2024

   Which of the following cannot function as an oxidising agent?
   1. (A)$${\mathrm{SO}}_4^{2-}$$
   2. (B)$${\mathrm{MnO}}_4^{-}$$
   3. (C)$${\mathrm{N}}^{3-}$$
   4. (D)$${\mathrm{BrO}}_3^{-}$$
   Show answerAnswer

   Answer: (C) ${\mathrm{N}}^{3-}$

3. Question 3 · JEE Main 2022

   Which of the given reactions is not an example of disproportionation reaction?
   1. (A)$$2{\mathrm{H}}_2{\mathrm{O}}_2\to 2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$$
   2. (B)$$2{\mathrm{NO}}_2+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{HNO}}_3+{\mathrm{HNO}}_2$$
   3. (C)$${\mathrm{MnO}}_4^{-}+4{\mathrm{H}}^{+}+3{\mathrm{e}}^{-}\to {\mathrm{MnO}}_2+2{\mathrm{H}}_2\mathrm{O}$$
   4. (D)$$3{\mathrm{MnO}}_4^{2-}+4{\mathrm{H}}^{+}\to 2{\mathrm{MnO}}_4^{-}+{\mathrm{MnO}}_2+2{\mathrm{H}}_2\mathrm{O}$$
   Show answerAnswer

   Answer: (C) ${\mathrm{MnO}}_4^{-}+4{\mathrm{H}}^{+}+3{\mathrm{e}}^{-}\to {\mathrm{MnO}}_2+2{\mathrm{H}}_2\mathrm{O}$

4. Question 4 · JEE Main 2021

   Identify the process in which the change in the oxidation state is five:
   1. (A)$$C{r}_2{O}_7^{2-}\to 2C{r}^{3+}$$
   2. (B)$$Mn{O}_4^{-}\to M{n}^{2+}$$
   3. (C)$$Cr{O}_4^{2-}\to C{r}^{3+}$$
   4. (D)$${C_2{O}_4}^{2-}\to 2C{O}_2$$
   Show answerAnswer

   Answer: (B) $Mn{O}_4^{-}\to M{n}^{2+}$

5. Question 5 · JEE Main 2021

   The oxidation states of 'P' in H 4 P 2 O 7 , H 4 P 2 O 5 and H 4 P 2 O 6 , respectively, are :
   1. (A)7, 5 and 6
   2. (B)5, 4 and 3
   3. (C)5, 3 and 4
   4. (D)6, 4 and 5
   Show answerAnswer

   Answer: (C) 5, 3 and 4

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