Electroanalytical Chemistry: Galvanic Cell Reactions Quiz
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Questions and Answers

What is the standard cell potential (Eocell) for the cell formed by the half-reactions Fe3+ + e- → Fe2+ and Zn2+ + 2e- → Zn?

  • -1.53 V
  • -0.01 V
  • 0.01V
  • 1.53 V (correct)
  • A Pt | H2; p1/solution of H2 ions / Pt | H2; p2 cell represents:

  • Electrode concentration cell (correct)
  • Electrolytic cell
  • None of these
  • Electrolyte concentration cell
  • In the galvanic cell prepared using zinc and iron, what reaction occurs at the cathode?

  • Fe2+ → Fe3+ + e- (correct)
  • Fe3+ + e- → Fe2+
  • Zn2+ + 2e- → Zn
  • Zn → Zn2+ + 2 e-
  • Which of the following factors does not affect the electrode potential of an electrode?

    <p>Size of the electrode</p> Signup and view all the answers

    If a hydrogen electrode is dipped in a solution of pH 3 at 25°C, what would be the potential?

    <p>-0.210 V</p> Signup and view all the answers

    If the salt bridge is removed between two half-cells, what happens to the voltage?

    <p>Decrease to be zero</p> Signup and view all the answers

    What is the closeness of the experimental results, or mean of a number of results, to the true value called?

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

    In a galvanic cell using zinc and iron, what reaction occurs at the anode?

    <p>Zn → Zn2+ + 2 e-</p> Signup and view all the answers

    An electrolyte is a substance which:

    <p>when dissolved in water, dissociates into ions</p> Signup and view all the answers

    What defines strong electrolytes?

    <p>dissociate into ions even at high concentration</p> Signup and view all the answers

    Why does an electrochemical cell stop working after some time?

    <p>one of the electrodes is eaten away</p> Signup and view all the answers

    Which statement is not true for a standard hydrogen electrode?

    <p>It contains a metallic conductor which does not absorb hydrogen</p> Signup and view all the answers

    What defines a half-cell reaction?

    <p>takes place at one electrode</p> Signup and view all the answers

    What are the advantages of electrochemical analysis due to?

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

    What does the standard hydrogen electrode consist of?

    <p>Platinum black foil (Platinum inert electrode)</p> Signup and view all the answers

    The significant disadvantage of the saturated calomel electrode (SCE) is

    <p>its potential is sensitive to changes in temperature</p> Signup and view all the answers

    The reference electrode that is thermally more stable is:

    <p>Ag/AgCl electrode</p> Signup and view all the answers

    In an electrolytic cell, which of the following is the half-cell where reduction takes place.

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

    Mercury covered by a layer of mercurous chloride in contact with saturated potassium chloride solution is a description of which electrode?

    <p>Reference electrode</p> Signup and view all the answers

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