NEET Chemistry / AI question bank / NCERT Class 11 / Redox 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.
Also called: oxidation and reduction · oxidation number · balancing redox equations
Questions
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- Q1In which of these compounds does oxygen carry a positive oxidation number?
Oxidation number rulesEasySingle correct
- Q2A 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
- Q3On 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
- Q4Tetrathionate ion, S₄O₆²⁻, is formed when iodine oxidises thiosulphate. What is the average oxidation number of sulphur in S₄O₆²⁻?
Fractional oxidation numbersMediumSingle correct
- Q5Acidified permanganate oxidises oxalate ions to carbon dioxide, itself being reduced to Mn²⁺. In the balanced ionic equation with the…
Balancing redox reactionsMediumSingle correct
- Q6Chlorine, bromine and iodine disproportionate in alkali, but fluorine behaves differently. Judge the Assertion (A) and the Reason (R) below.
Disproportionation reactionsMediumAssertion–Reason
- Q7Rods 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
- Q8Several 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
- Q9What 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
- Q10Standard 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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