Electrochemistry Test: 12th Grade! Quiz

25 Questions | Total Attempts: 59

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Electrochemistry Test: 12th Grade! Quiz

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Questions and Answers
  • 1. 
    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

    • C. 

      100% ionization at normal dilution

    • D. 

      Both a and b

  • 2. 
    E value for the cell reaction Cu∣Cu2+ (0.001M) ∣∣ Cu2+ (0.1m) ∣ Cu
    • A. 

      −RT ln(0.01) 

    • B. 

      −RT​ln(0.1) 

    • C. 

      +RT​ln(0.1) 

    • D. 

      +RT​ln(0.01) 

  • 3. 
    The equilibrium constant of the reaction; Cu(s)+ 2Ag+(aq)⟶Cu2+(aq) + 2Ag(s) E = 0.46 V at 298K
    • A. 

      4×1015

    • B. 

      2 × 1010

    • C. 

      4 ×1010

    • D. 

      2.4 ×1010

  • 4. 
    The charge required for the reduction of 1 mol of MnO4​− to MnO2​ is:
    • A. 

      1F

    • B. 

      3F

    • C. 

      5F

    • D. 

      6F

  • 5. 
    The highest electrical conductivity of the following aqueous solutions is of:
    • A. 

      0.1 M acetic acid

    • B. 

      0.1M difluoroacetic

    • C. 

      0.1M chloroacetic

    • D. 

      0.1 M fluoroacetic acid

  • 6. 
    For a spontaneous reaction the ΔG, equilibrium constant K and E0cell​ will be respectively:
    • A. 

      −ve , >1 ,+ve

    • B. 

      −ve, >1,  -ve

    • C. 

      −ve,

    • D. 

      +ve, >1,-ve

  • 7. 
    Specific conductance of 0.1 M nitric acid is 6.3 ˣ 10⁻² ohm⁻¹ cm⁻¹.The molar conductance of solution is
    • A. 

      630 ohm⁻¹ cm² mol⁻¹

    • B. 

      315 ohm⁻¹ cm² mol⁻¹

    • C. 

      100 ohm⁻¹ cm² mol⁻¹

    • D. 

      6,300 ohm⁻¹ cm² mol⁻¹

  • 8. 
    Which of the following statements is true for the electrochemical Daniel cell?
    • A. 

      Electrons flow from copper electrode to zinc electrode

    • B. 

      Current flows from zinc electrode to copper electrode

    • C. 

      Cations move toward copper electrode

    • D. 

      Cations move toward zinc electrode

  • 9. 
    The limiting molar conductivities of NaCl, KBr and KCl are 126, 152 and 150 Scm2mol−1 respectively. The limiting molar conductivity for NaBr is:
    • A. 

      278 

    • B. 

      128

    • C. 

      302

    • D. 

      176

  • 10. 
    When during electrolysis of a solution of AgNO3 9650 coulombs of charge pass through the electroplating bath, the mass of silver deposited on the cathode will be
    • A. 

      21.6 g

    • B. 

      1.08 g

    • C. 

      10.8 g

    • D. 

      108 g

  • 11. 
    The cost of electricity required to deposit 1 gm of Mg is Rs. 5.. How much would it cost to deposit 10 gm. of Al? (At wt. of Al=27, Mg=24)
    • A. 

      ₹ 10

    • B. 

      ₹ 27

    • C. 

      ₹ 44.44

    • D. 

      ₹ 66.67

  • 12. 
    One faraday of electricity will liberate one gram atom of metal from a solution of
    • A. 

      AuCl3

    • B. 

      AgNO3

    • C. 

      CuSO4

    • D. 

      CaCl2

  • 13. 
    Which one of the following statements is incorrect?
    • A. 

      Specific conductance increases on dilution

    • B. 

      Specific conductance decreases on dilution

    • C. 

      Molar conductance increases on dilution

    • D. 

      Equivalent conductance increases on dilution

  • 14. 
    A silver cup is plated with silver by passing 965 coulombs of electricity, the amount of silver deposited is:
    • A. 

      9.89 g

    • B. 

      107.87 g

    • C. 

      1.0787 g

    • D. 

      100.2 g

  • 15. 
    The specific conductance of a 0.01 M solution of KCl is 0.0014 ohm−1cm−1 at 25oC. Its equivalent conductance is
    • A. 

      140

    • B. 

      1.4

    • C. 

      14.0

    • D. 

      0.14

  • 16. 
    How many coulombs of electricity are consumed when a 100 mA current is passed through a solution of AgNO3​ for 30 minutes during electrolysis?
    • A. 

      108

    • B. 

      180

    • C. 

      18000

    • D. 

      3000

  • 17. 
    Assertion: The std electrode potential of SHE is zero.  Reason: SHE is a standard reference electrode.  Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Asertion is True but Reason is False. D : If both Assertion and Reason are False.  
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 18. 
    Assertion: Galvanised iron does not rust. Reason: Zinc has a more negative electrode potential than iron. Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Asertion is True but Reason is False. D : If both Assertion and Reason are False.
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 19. 
    ASSERTION The cell constant of cell depends upon the nature of the material of the electrodes. REASON The observed conductance of a solution depends upon the nature of the material of the electrodes. Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Asertion is True but Reason is False. D : If both Assertion and Reason are False.
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 20. 
    ASSERTION An electrochemical cell can be set-up only if the redox reaction is spontaneous. REASON A reaction is spontaneous if free energy change is negative. Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Asertion is True but Reason is False. D : If both Assertion and Reason are False.
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 21. 
    Assertion : Cu is stronger reducing agent than H2.  Reason: E of Cu2+/Cu is negative. Choose the answers appropriately.  A: If both Assertion and Reason are True and Reason is the correct explanation of Assertion. B : If both Assertion and Reason are True but Reason is the wrong explanation of Assertion. C : If Assertion is True but Reason is False. D : If both Assertion and Reason are False.
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 22. 
    If the Ecell​o for a given reaction has a negative value then which of the following gives the correct relationships for the values of ΔGo and Keq​?
    • A. 

      ΔGo>0 ;Keq​

    • B. 

      ΔGo>0;Keq​>1

    • C. 

      ΔGo

    • D. 

      ΔGo1

  • 23. 
    Resistance of 0.2 M solution of an electrolyte is 50Ω. The specific conductance of the solution is 1.3 Sm-1. If resistance of the 0.4M solution of the same electrolyte is 260Ω its molar conductivity is-
    • A. 

      6250 

    • B. 

      6.25 × 10-4

    • C. 

      625 × 10-4

    • D. 

      62.5

  • 24. 
    The molar conductivity of NaCl, HCl, and CH3​COONa at infinite dilution are 126.45, 426.16 and 91Scm2mol−1 respectively. The molar conductivity of CH3​COOH at infinite dilution is:
    • A. 

      290.8

    • B. 

      390.5

    • C. 

      425.5

    • D. 

      180.5

  • 25. 
    For Zn2+ | Zn, E0 = - 0.76 V then EMF of the cell  Zn|Zn2+ (1 M) || 2H+ (1 M)l H2 (1 atm) will be
    • A. 

      -0.76

    • B. 

      O.76

    • C. 

      -0.38

    • D. 

      0.38

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