NEET ChemistryNCERT Class 11Redox Reactions and Electrochemistry

Redox Reactions: NEET questions with solutions

NEET tests oxidation-number rules and their exceptions (peroxides, superoxides, OF₂, metal hydrides), fractional averages, classification of redox reactions, balancing in acid or base, redox titration stoichiometry and E°-based predictions. Marks are lost by forgetting the charge on an ion, by miscounting electrons per formula unit, and by misreading which way the electrode-potential series runs.

Revise first: NCERT notes for Redox Reactions

Questions

10 questions · answers after you pick

1In which of these compounds does oxygen carry a positive oxidation number?Oxidation number rulesEasySingle correct 2A zinc strip is placed in copper sulphate solution: Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s). Which species acts as the reducing agent?Redox as electron transferEasySingle correct 3On standing, hydrogen peroxide slowly breaks down: 2H₂O₂(aq) → 2H₂O(l) + O₂(g). Which type of redox reaction is this best described as?Types of redox reactionsEasySingle correct 4Tetrathionate ion, S₄O₆²⁻, is formed when iodine oxidises thiosulphate. What is the average oxidation number of sulphur in S₄O₆²⁻?Fractional oxidation numbersMediumSingle correct 5Acidified permanganate oxidises oxalate ions to carbon dioxide, itself being reduced to Mn²⁺. In the balanced ionic equation with the…Balancing redox reactionsMediumSingle correct 6Chlorine, bromine and iodine disproportionate in alkali, but fluorine behaves differently. Judge the Assertion (A) and the Reason (R) below.Disproportionation reactionsMediumAssertion–Reason 7Rods of zinc and copper are dipped in solutions of metal salts at room temperature. Which of the statements below are correct?Competitive electron transfer reactionsMediumStatement based 8Several compounds break the usual oxidation-number rules. Match the element in each compound of List I with its oxidation number in List II.Oxidation number rulesMediumMatch the following 9What volume of 0.020 M KMnO₄ is needed to oxidise completely 25.0 mL of 0.10 M FeSO₄ in acidic solution?Redox titrationsHardSingle correct 10Standard reduction potentials: MnO₄⁻/Mn²⁺ +1.51 V; Cl₂/Cl⁻ +1.36 V; Cr₂O₇²⁻/Cr³⁺ +1.33 V; Ag⁺/Ag +0.80 V. Under standard conditions in acid…Redox couples and electrode potentialsHardSingle correct

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