Electrochemistry Quiz: MCQ Exam! Trivia

15 Questions | Total Attempts: 1455

SettingsSettingsSettings
Please wait...
Electrochemistry Quiz: MCQ Exam! Trivia


Questions and Answers
  • 1. 
    Which of the following decreases with dilution:
    • A. 

      Molar Conductance

    • B. 

      Conductance

    • C. 

      Specific Conductance

    • D. 

      Equivalent Conductance

  • 2. 
    An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to:
    • A. 

      Increase in number of ions

    • B. 

      Increase in ionic mobility of ions

    • C. 

      100% ionisation of electrolyte at normal dilution

    • D. 

      Increase in both i.e., number of ions and ionic mobility of ions

  • 3. 
    • A. 

      The standard reduction potential of Li+/Li is lower than that of Cu+/Cu

    • B. 

      The standard reduction potential of Cu+/Cu is lower than that of Li+/Li

    • C. 

      The standard oxidation potential of Li+/Li is lower than that of Cu+/Cu

    • D. 

      Li is smaller in size as compared to Cu

  • 4. 
    The standard electrode potential is measured by:
    • A. 

      Electrometer

    • B. 

      Voltmeter

    • C. 

      Pyrometer

    • D. 

      Galvanometer

  • 5. 
    • A. 

      KNO3 is highly soluble in water

    • B. 

      Velocity of (NO3)- is greater than that of K+

    • C. 

      Velocity of K+ is greater than that of (NO3)-

    • D. 

      Velocity of both K+ and (NO3)- are nearly the same

  • 6. 
    What would happen if the electrodes used in the electrolysis process rective:
    • A. 

      Electrode does not participate in the chemical reaction

    • B. 

      Electrodes only act as source and sink for electrons

    • C. 

      Electrodes participate in the electrode reaction

    • D. 

      Electrodes are burnt up

  • 7. 
    9.65 C of electric current is passed through fused anhydrous magnesium chloride. The magnesium metal thus, obtained is completely converted into a Grignard reagent. The number of moles of the Grignard reagent obtained is:
    • A. 

      5 x 10-4

    • B. 

      1 x 10-4

    • C. 

      5 x 10-5

    • D. 

      1 x 10-5

  • 8. 
    Resistance of a conductive cell filled with a solution of an electrolyte of concentration 0.1 M is 100 Ω. The conductivity of this solution is 1.29 S m–1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 Ω. The molar conductivity of 0.02 M solution of the electrolyte will be:
    • A. 

      1240 x 10-4 S m2 mol-1

    • B. 

      124 x 10-4 S m2 mol-1

    • C. 

      12.4 x 10-4 S m2 mol-1

    • D. 

      1.24 x 10-4 S m2 mol-1

  • 9. 
    The reduction potential of hydrogen half-cell will be negative if:
    • A. 

      P(H2) = 1 atm and [H+] =  M

    • B. 

      P(H2) = 1 atm and [H+] = 2 M

    • C. 

      P(H2) = 2 atm and [H+] = 1 M

    • D. 

      P(H2) = 2 atm and [H+] = 2 M

  • 10. 
    The hydrogen electrode is dipped in a solution of pH 3 at 25°C. The potential would be (the value of 2.303 RT/F is 0.059 V)
    • A. 

      0.177 V

    • B. 

      - 0.177 V

    • C. 

      0.059 V

    • D. 

      - 0.059 V

  • 11. 
    Which of the following reaction is preferred during electrolysis of dilute sulphuric acid:
    • A. 

      2H2O (l) → O2 (g) + 4H+ (aq) + 4e-

    • B. 

      2SO42- (g) → S2O82- (g) + 2e-

    • C. 

      2H2 (g) + 4OH- (aq) → 4H2O (l) + 4e-

    • D. 

      2SO42- (aq) → S2O82- (aq) + 2e-

  • 12. 
    The standard electrode potential for the half cell reactions are: The E.M.F. of the cell reaction
    • A. 

      – 1.20 V

    • B. 

      + 1.20 V

    • C. 

      + 0.32 V

    • D. 

      – 0.32 V

  • 13. 
    Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 × 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminum is produced? (Assume 100% current efficiency, atomic mass of Al = 27 g/mol)
    • A. 

      9.0 x 103 g

    • B. 

      8.1 x 104 g

    • C. 

      2.4 x 105 g

    • D. 

      9.0 x 103 g

  • 14. 
    When KMnO4 acts as an oxidizing agent and ultimately forms MnO42–, MnO2, Mn2O3 and Mn2+, then the number of electrons transferred in each case is:
    • A. 

      1, 3, 4, 5

    • B. 

      3, 7, 1, 5

    • C. 

      4, 3, 1, 5

    • D. 

      1, 5, 7, 3

  • 15. 
    For a cell reaction involving two electrons change, the standard E.M.F. of the cell is found to be 0.295 V at 25°C. The equilibrium constant of the reaction at 25°C is:
    • A. 

      2.95 x 10-2

    • B. 

      2.95 x 102

    • C. 

      1 x 1010

    • D. 

      1 x 10-10