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Chemistry - Redox Reactions

Practise 17 WBJEE previous year questions on Redox Reactions, compiled from papers spanning 2009 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.

Redox Reactions has been asked in 12 of the 18 years of WBJEE papers analysed (2009–2026), with 17 questions in all. 41% of them were easy, 53% moderate and 6% tough. Most of its questions came from 2017, with 3 questions that year. In the last three years (2024–2026) it had 5 questions across 3 papers, about 1.7 per paper.

The chapter's 5 topics are not weighted equally: Equivalence concept (8 questions, 47%), Oxidation number (3 questions, 18%), and Oxidation and Reduction Reactions (3 questions, 18%) have been asked the most. Equivalence concept has also led over the last five years, with 3 questions. Equivalence concept has produced the most tough questions (1).

  1. 1A compound (X) when treated with solution yields a brown precipitate. On adding hypo solution the precipitate turns white. The compound (X) 2026Oxidation and Reduction Reactions
  2. 2What is the four-electron reduced form of ?2025Oxidation number
  3. 3As per the following equation, 0.217 g of HgO (molecular mass ) reacts with excess iodide. On titration of the resulting solution, how many 2025Redox titration
  4. 4The equivalent weight of Gram molecular weight in the given reaction is2024Equivalence concept
  5. 5Identify the correct statements(s) :2024Oxidation number
  6. 6The equivalent weight of \( {KIO}_3\) in the given reaction is (\( {M}=\) molecular mass) : \(2 {Cr}( {OH})_3+4 {OH}^{-}+ {KIO}_3 2 {CrO}_4{2023Equivalence concept
  7. 7How much solid oxalic acid (Molecular weight 126 ) has to be weighed to prepare exactly (N) oxalic acid solution in water?2022Equivalence concept
  8. 8Indicate the products and in the following reactions:2021Balancing of redox reactions
  9. 9Out of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one?2018Oxidation and Reduction Reactions
  10. 10of an acid is needed to completely neutralise (N) NaOH solution. The equivalent weight of the acid is2017Equivalence concept
  11. 11You are supplied with each of and . What is the maximum volume of 3M HCl that you can prepare using only these two solutions?2017Equivalence concept
  12. 12How many faradays are required to reduce of to - in acid medium?2017Oxidation and Reduction Reactions
  13. 13In aqueous alkaline solution, two electrons reduction of gives2015Balancing of redox reactions
  14. 142 gm of metal carbonate is neutralized completely by \(100 {ml}\) of \(0.1( {~N}) {HCl}\). The equivalent weight of metal carbonate is2011Equivalence concept
  15. 15If the molecular wt. of \( {Na}_2 {~S}_2 {O}_3\) and \( {I}_2\) are \( {M}_1\) and \( {M}_2\) respectively, then what will be the equivalent2011Equivalence concept
  16. 16In the reaction of sodium thiosulphate with in aqueous medium the equivalent weight of sodium thiosulphate is equal to2010Equivalence concept
  17. 17Of the following acids the one which has the capability to form complex compound and also possesses oxidizing and reducing properties is :2009Oxidation number

Frequently Asked Questions

1.How many questions are available for Redox Reactions?

This chapter includes 17 questions compiled from WBJEE papers spanning 2009 to 2026.

2.Are these questions only from WBJEE, or from other exams too?

These are WBJEE questions specifically for the Redox Reactions chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Redox Reactions an important chapter for WBJEE Chemistry?

Redox Reactions has appeared in 12 of the 18 years of WBJEE papers covered here, with 17 questions across 12 papers - about one per paper it appears in.

4.What is the difficulty level of Redox Reactions questions in WBJEE?

Of the 17 questions analysed for this chapter, 41% are easy, 53% moderate and 6% tough. 2017 had the most, with 3 questions.

5.Which topics in Redox Reactions should I focus on?

These topics have carried the most weightage in Redox Reactions:

  • Equivalence concept - 8 questions (47%)
  • Oxidation number - 3 questions (18%)
  • Oxidation and Reduction Reactions - 3 questions (18%)
  • Equivalence concept has produced the most tough questions (1).
6.Is Redox Reactions's weightage in WBJEE going up or down?

Across all 12 papers analysed, Redox Reactions has averaged about 1.4 questions per paper. In the last three years (2024–2026), that average has risen, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.