Redox Reactions
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Questions and Answers

What is the oxidation number of a single monatomic ion?

  • Always zero
  • Equal to the charge on the ion (correct)
  • Always one
  • Equal to the electronegativity of the ion

    • Which of the following is an example of a reduction process?

  • 2Mg(s) + O2(g) → 2MgO(s)
  • Zn(s) → Zn2+(aq) + 2e-
  • C2H4(g) + H2(g) → C2H6(g) (correct)
  • 2H2S(g) + O2(g) → 2S(s) + 2H2O(l)

    • What is the oxidation number of hydrogen in H2O?

  • +2
  • -1
  • 0
  • +1 (correct)

    • What is the oxidation number of oxygen in O2?

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

    Which of the following is an example of an oxidation reaction?

    <p>2Mg(s) + O2(g) → 2MgO(s)</p> Signup and view all the answers

    What is the oxidation number of sodium in Na2O?

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

    What is the average oxidation number of carbon atoms in carbon suboxide?

    <p>4/3</p> Signup and view all the answers

    What is the oxidation number of manganese in MnO4-?

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

    What is the oxidation number of hydrogen in H2O?

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

    What is the oxidation number of iodine in I2?

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

    What is the oxidation number of sulphur in the tetrathionate ion (S4O6)2-?

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

    What is the type of reaction that involves the change in oxidation state of an element from two different oxidation states to the same oxidation state?

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

    What is the oxidation number of fluorine in its compounds?

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

    What is the sum of oxidation numbers of all atoms in a neutral compound?

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

    What is the oxidation number of oxygen in most of its compounds?

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

    What is the oxidation number of hydrogen in metal hydrides?

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

    What is the oxidation number of chlorine in HClO₄?

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

    What is the oxidation number of oxygen in superoxides?

    <p>-1/2</p> Signup and view all the answers

    What is the primary purpose of using a double indicator in a titration reaction?

    <p>To identify the completion of multiple reactions</p> Signup and view all the answers

    In a double indicator titration, what is the significance of the pH range of the indicators?

    <p>It determines the range of pH change at the equivalence point</p> Signup and view all the answers

    In a double indicator titration, what is the significance of the methyl orange indicator?

    <p>It indicates the completion of the second reaction</p> Signup and view all the answers

    In a double indicator titration, what is the significance of the phenolphthalein indicator?

    <p>It indicates the completion of the first reaction</p> Signup and view all the answers

    In a double indicator titration, what is the formula to calculate the number of milliequivalents of HCl?

    <p>m.eq.of HCl = m.eq.of NaOH + m.eq.of Na2CO3 + meq.of NaHCO3</p> Signup and view all the answers

    What is the primary purpose of iodometric titration?

    <p>To determine the concentration of an oxidizing agent</p> Signup and view all the answers

    What is the purpose of adding an excess of the intermediate reactant in a back titration?

    <p>To allow for the determination of the purity of the analyte</p> Signup and view all the answers

    What is the formula used to calculate the normality of the intermediate reactant?

    <p>N1V1 = N2V2</p> Signup and view all the answers

    What is the significance of the equivalence point in a back titration?

    <p>It is the point where the analyte is completely reacted</p> Signup and view all the answers

    What is the purpose of titrating the resulting solution with a known volume and concentration of titrant?

    <p>To determine the excess volume of the intermediate reactant</p> Signup and view all the answers

    What is the calculation used to determine the mass of the analyte?

    <p>m.eq.of analyte = Total m.eq.of intermediate reactant - m.eq.of excess intermediate reactant</p> Signup and view all the answers

    What is the result of the back titration in the given example?

    <p>The chalk contains 0.25 gm of impurities</p> Signup and view all the answers

    At the equivalence point, what is the relationship between the normality of the analyte and the titrant?

    <p>N1V1 = N2V2</p> Signup and view all the answers

    What is the purpose of adding H2SO4 in a titration using potassium permanganate?

    <p>To acidify the solution</p> Signup and view all the answers

    In a titration using potassium dichromate, what is the role of the diphenylamine indicator?

    <p>To indicate the end point of the reaction</p> Signup and view all the answers

    What is the difference between the oxidizing power of potassium permanganate and potassium dichromate?

    <p>KMnO4 is a stronger oxidizing agent than K2Cr2O7</p> Signup and view all the answers

    What is the purpose of titration in determining the purity of a substance?

    <p>To determine the amount of impurities in the substance</p> Signup and view all the answers

    What is the significance of the equivalence point in a titration reaction?

    <p>It is the point at which the number of equivalents of the analyte reacts with the number of equivalents of the titrant</p> Signup and view all the answers

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