Redox Reactions
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Questions and Answers

What type of redox reaction involves the transfer of electrons between two substances in the same vessel?

  • Indirect redox reaction
  • Electrochemical reaction
  • Direct redox reaction (correct)
  • Intermolecular redox reaction
  • What is the term for a reaction in which oxidation and reduction take place simultaneously?

  • Redox reaction (correct)
  • Electrolysis
  • Electrochemical reaction
  • Corrosion reaction
  • What type of compounds contain an element in a lower oxidation state?

  • Covalent compounds
  • Ionic compounds
  • Ous compounds (correct)
  • Organic compounds
  • What is the term for the decrease in oxidation number of an element?

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

    What is the strongest reducing agent in solution?

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

    What is the oxidation state of sulfur in Na2SO3?

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

    What is the purpose of starch solution in the evolution of iodine from KI solution in the presence of turpentine?

    <p>To detect the presence of iodine</p> Signup and view all the answers

    What is the phenomenon where Na2SO3 solution is oxidized by air in the presence of Na3AsO3 solution?

    <p>Induced oxidation</p> Signup and view all the answers

    What is the oxidation state of chlorine in KClO3?

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

    What happens to the oxidation state of an element when it acts as an oxidizing agent?

    <p>It decreases</p> Signup and view all the answers

    What is the result of the reduction of CuO with carbon?

    <p>Cu + CO</p> Signup and view all the answers

    What is the oxidation number of iron in the reaction Fe + S → FeS?

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

    What type of reaction involves the addition of hydrogen?

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

    What is the result of the reaction MnO2 + 4H+ + 4Cl- → MnCl2 + 2H2O + Cl2?

    <p>Oxidation of Mn</p> Signup and view all the answers

    What type of agent is fluorine?

    <p>Oxidising agent</p> Signup and view all the answers

    What is the oxidation state of sulfur in the reaction H2S + Cl2 → 2HCl + S?

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

    Which ions are not included in the final balanced ionic equation?

    <p>Spectator ions</p> Signup and view all the answers

    What is the term for the reaction in which one substance loses electrons and another substance gains electrons?

    <p>Redox reaction</p> Signup and view all the answers

    What is the purpose of writing ionic equations?

    <p>To simplify the representation of the reaction</p> Signup and view all the answers

    What is the oxidation state of an element that acts as a reducing agent?

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

    What is the oxidation state of iron in the complex [Fe(CN)6]3-?

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

    Which of the following reactions is an example of indirect redox reaction?

    <p>FeCl2 + Cu → Fe + CuCl2</p> Signup and view all the answers

    What is the first step in the ion-electron method for balancing redox reactions?

    <p>Write down the redox reaction in ionic form</p> Signup and view all the answers

    What is the change in oxidation number of magnesium in the reaction Mg2+ → Mg0?

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

    What is the role of the activator in autoxidation?

    <p>To combine with oxygen to form an addition compound</p> Signup and view all the answers

    What is the process by which [Fe(CN)6]3- is reduced to [Fe(CN)6]4-?

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

    What is the purpose of dividing the half reaction by 2, 3, etc. in the ion-electron method?

    <p>To balance the number of atoms of each element</p> Signup and view all the answers

    What is the direction of electron transfer in the reaction [Fe(CN)6]3- + e- → [Fe(CN)6]4-?

    <p>From e- to [Fe(CN)6]4-</p> Signup and view all the answers

    What is the result of the autoxidation of water in the presence of an activator?

    <p>Formation of hydrogen peroxide</p> Signup and view all the answers

    What is the term for the phenomenon where a substance absorbs oxygen from the air in the presence of water?

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

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