Redox Reactions Quiz
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Questions and Answers

Which of the following reactions represents a disproportionation reaction?

  • CH4 + 2O2 → CO2 + 2H2O
  • 2NO2 + 2OH → NO2 + NO3 + H2O
  • 2F2 + 2OH → 2F + OF2 + H2O (correct)
  • CH4 + 4Cl2 → CCl4 + 4HCl

    • What happens to MnO4 when it undergoes disproportionation?

  • It is reduced but does not produce any compounds.
  • It remains unchanged.
  • It produces MnO2 and H2O. (correct)
  • It forms a new oxide and loses electrons.

    • Which of the following statements about PbO2 is true?

  • It cannot be oxidized further. (correct)
  • It is a strong oxidizing agent.
  • It readily reacts with acids.
  • It produces water upon reaction with HNO3.

    • Which of the following elements does not exhibit a tendency to undergo disproportionation?

    <p>F</p> Signup and view all the answers

    In which oxidation state is manganese found in MnO4–?

    <p>+7</p> Signup and view all the answers

    In the decomposition reaction 2KClO3 → 2KCl + 3O2, which of the following statements is correct?

    <p>Oxygen is reduced.</p> Signup and view all the answers

    Which of the following reactions is classified as an acid-base reaction?

    <p>2PbO + 4HCl → 2PbCl2 + 2H2O</p> Signup and view all the answers

    In the reaction Zn + 2HCl → ZnCl2 + H2, which statement is true?

    <p>Zinc is acting as a reductant.</p> Signup and view all the answers

    Which outermost electronic configuration allows for the exhibition of multiple oxidation states?

    <p>3d^4s^2</p> Signup and view all the answers

    What is the oxidation number of Sulfur in S2O4 based on its Lewis structure?

    <p>+4</p> Signup and view all the answers

    During the assignment of oxidation numbers, what is noted about an atom with more electrons than its neutral state?

    <p>The oxidation number is negative.</p> Signup and view all the answers

    In the reaction P4 + 3OH + 3H2O → PH3 + 3H2PO2, what is true about phosphorus?

    <p>Phosphorus is undergoing both oxidation and reduction.</p> Signup and view all the answers

    Which reaction indicates elements undergoing oxidation and reduction?

    <p>Zn + 2HCl → ZnCl2 + H2</p> Signup and view all the answers

    Which reaction does not occur when PbO2 is treated with HNO3?

    <p>No reaction occurs.</p> Signup and view all the answers

    Which of the following statements is correct regarding oxidation states?

    <p>An element with the configuration 3s^2 can have multiple oxidation states.</p> Signup and view all the answers

    Which statement accurately describes an electron pair shared between two atoms of different electronegativity?

    <p>It is assigned to the more electronegative atom.</p> Signup and view all the answers

    What is the oxidation state of chromium in Cr2O7?

    <p>+6</p> Signup and view all the answers

    Which ion represents a cation?

    <p>FeF6</p> Signup and view all the answers

    What is the sum of oxidation numbers in a neutral molecule?

    <p>0</p> Signup and view all the answers

    Which statement is correct about fluorine in NaF?

    <p>It has an oxidation state of -1.</p> Signup and view all the answers

    In the context of oxidation, how is fluorine classified among halogens?

    <p>The best oxidant.</p> Signup and view all the answers

    What occurs to the oxidation state of manganese in potassium permanganate during a reaction?

    <p>It changes from +2 to +7.</p> Signup and view all the answers

    What type of reaction is the decomposition of hydrogen peroxide into water and oxygen?

    <p>Disproportionation reaction.</p> Signup and view all the answers

    Which statement is true regarding the assertion that fluorine is the most electronegative atom?

    <p>Both assertion and reason are true, and the reason explains the assertion.</p> Signup and view all the answers

    Which half-reaction has the highest reduction potential?

    <p>F2(g)/2F-(aq)</p> Signup and view all the answers

    What is the product of the reaction between Cl2(g) and OH-(aq) in a bleaching process?

    <p>Both B and C</p> Signup and view all the answers

    Why does MnO4- not undergo disproportionation in acidic medium?

    <p>It is too stable.</p> Signup and view all the answers

    Which statement correctly describes the reactivity of PbO compared to PbO2 with HCl?

    <p>PbO reacts while PbO2 does not because of oxidation states.</p> Signup and view all the answers

    In the balancing of the reaction between MnO4- and SO2, what is the oxidation state of manganese in Mn2+?

    <p>+2</p> Signup and view all the answers

    What is the nature of nitric acid when it reacts with PbO?

    <p>It acts as an oxidizing agent.</p> Signup and view all the answers

    What is the primary product of the reaction between Cl2O7 and hydrogen peroxide in acidic medium?

    <p>ClO2-(aq)</p> Signup and view all the answers

    What is the oxidation number of phosphorus in HPO3?

    <p>+3</p> Signup and view all the answers

    What is the oxidation number of sulphur in Na2S2O3?

    <p>4</p> Signup and view all the answers

    Which compound contains sulphur with an oxidation number of +6?

    <p>3</p> Signup and view all the answers

    In the reaction 2Fe2+ + Cr2O7^2- + H+ → Cr + Fe + H2O, which species is the oxidizing agent?

    <p>3</p> Signup and view all the answers

    In the equation I2 + S2O3^2- → I + S4O6^2-, which species acts as the reducing agent?

    <p>2</p> Signup and view all the answers

    Which of the following reactions is a redox reaction?

    <p>5</p> Signup and view all the answers

    When balancing the equation Cr2O7^2- + H+ + I^- → Cr + I2 + H2O, how many electrons are transferred?

    <p>4</p> Signup and view all the answers

    In balancing the ionic equation MnO4^- + Br^- + H+ → Mn + Br2 + H2O, what is the oxidation state of manganese in MnO4^-?

    <p>7</p> Signup and view all the answers

    Which of the following correctly identifies both the oxidizing and reducing agents in the reaction HgCl2 + 2KI → HgI2 + 2KCl?

    <p>HgCl2, KI</p> Signup and view all the answers

    What is the oxidation state of each sulfur atom that is attached to oxygen in the S4O6 structure?

    <p>+5</p> Signup and view all the answers

    How many total sulfur atoms are considered when calculating the average oxidation state in S4O6?

    <p>4</p> Signup and view all the answers

    What is the average oxidation state of sulfur atoms in S4O6?

    <p>2.5</p> Signup and view all the answers

    Which oxidation state is assigned to each oxygen atom in the S4O6 molecule?

    <p>-2</p> Signup and view all the answers

    How many electrons does a central sulfur atom share in S4O6?

    <p>6</p> Signup and view all the answers

    What happens to the oxidation state of sulfur as the number of oxygen attachments increases?

    <p>-2</p> Signup and view all the answers

    What charge do metal atoms typically have in similar chemical environments as S4O6, in relation to electron loss?

    <p>1</p> Signup and view all the answers

    What is the reason for oxygen atoms being in a -2 oxidation state in S4O6?

    <p>2</p> Signup and view all the answers

    Study Notes

    Redox Reactions - Multiple Choice Questions (Type-I)

    • Identifying Non-Redox Reactions: Barium chloride reacting with sulfuric acid (BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl) is not a redox reaction.

    • Oxidizing Agent Tendency: The species with the most positive E° value has the greatest tendency to be reduced (strongest oxidizing agent). Ag⁺ is the strongest oxidizing agent in the provided examples.

    • Redox Couple E° Values and Predicting Reactions: Based on provided E° values, copper (Cu) can reduce bromine (Br⁻) and iodide (I⁻) ions, but not bromine as a base (Br₂).

    Redox Reactions - Multiple Choice Questions (Type-II)

    • Decomposition Reaction Analysis: In 2KClO₃ → 2KCl + 3O₂, potassium is not undergoing oxidation and chlorine is not undergoing oxidation. Oxygen is reduced, and no species are undergoing reduction or oxidation.

    • Reaction Analysis (Zinc and Hydrochloric Acid): In Zn + 2HCl → ZnCl₂ + H₂, zinc acts as a reducing agent, chlorine acts as an oxidizing agent, hydrogen acts as an oxidizing agent; zinc is reduced.

    Short Answer Type

    • Disproportionation Reaction of MnO₂: Manganese(IV) does not undergo disproportionation because it is in its highest oxidation state (+7) and cannot be further oxidized.

    • Redox Reactions and HCl: Lead(II) oxide (PbO) reacts with HCl in an acid-base reaction, while lead(IV) oxide (PbO₂) undergoes a redox reaction.

    • Nitric Acid and Lead Oxides: Nitric acid reacts with lead(II) oxide (PbO) but not lead(IV) oxide because they are in different oxidation states. (PbO2) is already the highest oxidation state of lead

    Balanced Chemical Equations

    • Permanganate and Sulphur Dioxide Reaction: A given chemical reaction needs to be balanced according to the provided details.

    • Hydrazine and Chlorate Reaction: In basic medium, a given reaction needs to be balanced according to the provided details.

    • Dichlorine Heptaoxide and Hydrogen Peroxide Reaction: A given reaction needs to be balanced according to the provided details.

    Oxidation Numbers of Phosphorus/Sulfur

    • Calculating Oxidation Numbers: Oxidation numbers of phosphorus and sulfur in various compounds must be calculated using rules and methods provided in the text.

    Balancing Equations by Oxidation Number Method

    • Balancing Redox Equations: Chemical equations are balanced based on the oxidation number method.

    Identifying Redox Reactions and Agents

    • Identifying Redox Species: Identify the oxidizing and reducing agents in given redox reactions.

    Matching Type

    • Oxidation States of Elements: Matching oxidation states (e.g., Cr₂O₇²⁻, MnO₂) with appropriate values.

    • Terms Related to Oxidation Numbers: Matching definitions of positive/negative ions, elements in free state, the sum of oxidation numbers in a molecule, etc.

    Assertion and Reason Type

    • Fluorine's Oxidizing Power: Fluorine is the strongest oxidizing agent due to its high electronegativity.

    • Permanganate and Iodine Reaction: Permanganate acts as an oxidizing agent in the reaction with potassium iodide. The manganese oxidation number changes from +7 to +2

    Redox Reactions - Electron Transfer

    • Redox Definitions: Redox reactions involve electron transfer, with one species losing electrons (oxidation) and another gaining them (reduction).

    • Examples of Redox Reactions: Examples need to be found that clearly demonstrate electron transfer to be considered a reduction.

    • Reactions Based on E° Values: Predict which reactions will occur based on the standard electrode potential differences of species.

    Additional Concepts

    • Oxidation State Relationships: Explain the relationship between oxidation states and electronic configurations in reference to predicting which states of atoms will be exhibited in compounds.

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    Description

    Test your knowledge on redox reactions with this quiz that covers important concepts such as oxidizing agents, E° values, and reaction predictions. Understand the differences between redox and non-redox reactions through a series of multiple choice questions.

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