JEE Chemistry
Oxidation Number & Redox Reactions: JEE Questions & Solutions
30 previous-year JEE Chemistry questions on Oxidation Number & Redox Reactions, each with a worked step-by-step solution.
Basic
Previous-year questions
- 01MnO₄²⁻, in acidic medium, disproportionates to:MCQEasyJEE 2026
- 02Consider the reactions: 1. NaCl+K₂Cr₂O₇+H₂SO₄ → A +... 2. A + NaOH → B +... 3. B + H₂SO₄+H₂O₂ → C +... In the product 'C', X is the number…NVAMediumJEE 2026
- 03The oxidation state of chromium in the final product formed in the reaction between KI and acidified K₂Cr₂O₇ solution is:MCQEasyJEE 2026
- 04200 cc of x × 10⁻³ M potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr's salt solution in acidic medium. Here x = _____.NVAEasyJEE 2026
- 05X and Y are the number of electrons involved, respectively during the oxidation of I⁻ to I₂ and S²⁻ to S by acidified K₂Cr₂O₇. The value of…NVAEasyJEE 2026
- 06500 mL of 1.2 M KI solution is mixed with 500 mL of 0.2 M KMnO₄ solution in basic medium. The liberated iodine is titrated with standard…NVAMediumJEE 2026
- 07Consider the following reactions: The oxidation states of Cu in Z and Q, respectively are:MCQEasyJEE 2026
- 08The species which does not undergo disproportionation reaction is:MCQEasyJEE 2025
- 09The incorrect statements among the following is:MCQEasyJEE 2025
- 10Which of the following oxidation reactions are carried out by both K₂Cr₂O₇ and KMnO₄ in acidic medium? A. I⁻ → I₂ B. S²⁻ → S C. Fe²⁺ → Fe³⁺…MCQMediumJEE 2025
- 11KMnO₄ acts as an oxidising agent in acidic medium. 'X' is the difference between the oxidation states of Mn in reactant and product. 'Y' is…NVAEasyJEE 2025
- 12The reaction Zn + H₂SO₄ → ZnSO₄ + H₂ is an example of:MCQEasyJEE 2024
- 13From the given list, the number of compounds with +4 oxidation state of Sulphur is: SO₃, H₂SO₃, SOCl₂, SF₄, BaSO₄, H₂S₂O₇NVAMediumJEE 2024
- 14Which of the following cannot function as an oxidising agent?MCQEasyJEE 2024
- 151 mole of PbS is oxidized by “X” moles of O₃ to get “Y” moles of O₂. X + Y = ?NVAEasyJEE 2024
- 16Chlorine undergoes disproportionation in alkaline medium as shown below: aCl₂(g) + bOH⁻(aq) → cClO⁻(aq) + dCl⁻(aq) + eH₂O(l) The values of…MCQEasyJEE 2024
- 172MnO₄⁻ + b I⁻ + c H₂O → x I₂ + y MnO₂ + z OH⁻ If the above equation is balanced with integer coefficients, the value of z is.NVAMediumJEE 2024
- 18Total number of species from the following which can undergo a disproportionation reaction: H₂O₂, ClO₃⁻, P₄, Cl₂, Ag, Cu⁺, F₂, NO₂, KMCQMediumJEE 2024
- 19Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from:MCQEasyJEE 2023
- 20The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is.NVAEasyJEE 2023
- 21H₂O₂ acts as a reducing agent in:MCQEasyJEE 2023
- 22Sum of oxidation states of bromine in bromic acid and perbromic acid is.NVAEasyJEE 2023
- 23During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the…MCQMediumJEE 2023
- 24The reaction: 2IO₃⁻ + xI⁻ + 12H⁺ → 6I₂ + 6H₂O What is the value of x?MCQEasyJEE 2023
- 25The difference in the oxidation state of Xe between the oxidised product of Xe formed on complete hydrolysis of XeF₄ and XeF₄ isNVAEasyJEE 2023
- 26In alkaline medium, the reduction of permanganate anion involves a gain of electrons.NVAEasyJEE 2023
- 27The correct group of halide ions which can be oxidized by oxygen in acidic medium isMCQEasyJEE 2023
- 28See the following chemical reaction: Cr₂O₇²⁻ + XH⁺ + 6Fe²⁺ → YCr³⁺ + 6Fe³⁺ + ZH₂O The sum of X, Y and Z is.NVAEasyJEE 2023
- 29During water-gas shift reactionMCQEasyJEE 2023
- 30The total change in the oxidation state of manganese involved in the reaction of KMnO₄ and potassium iodide in acidic medium isNVAEasyJEE 2023
Frequently asked questions
Our bank has 30 previous-year JEE Chemistry questions tagged to Oxidation Number & Redox Reactions, drawn from JEE papers between 2023 and 2026, including 7 from 2026 alone. Each comes with a full step-by-step solution.
Oxidation Number & Redox Reactions is rated Basic overall for JEE Chemistry. The PYQs on this page break down as 23 easy, 7 medium.
Of the 30 previous-year questions on Oxidation Number & Redox Reactions, 16 are multiple-choice (MCQ) and 14 are numerical-value (NVA) questions.
Based on recent paper analysis, Oxidation Number & Redox Reactions is worth about 2 marks in JEE Main. It sits in Redox Reactions & Electrochemistry, a Class 12 Chemistry chapter.
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