Unit 4: Electrochemistry - Practice Quiz

1 The cell constant of a conductivity cell is defined as the ratio of the distance between the electrodes to their area of cross-section, expressed as:

2 The unit of cell constant is:

3 Cell constant is obtained by multiplying the observed conductance by which quantity?

4 The SI-based common unit of specific conductance (conductivity) is:

5 If the specific conductance of a solution is and its molar concentration is , the molar conductance is:

6 Molar conductance is related to specific conductance and molar concentration (in ) by:

7 A substance that conducts electricity in molten or aqueous state by producing ions is called:

8 Which of the following is a strong electrolyte?

9 In an electrochemical cell, conduction of current within the electrolyte solution occurs through the movement of:

10 In a galvanic cell, chemical energy is converted into:

11 In an electrolytic cell, the reaction occurring is:

12 In a galvanic cell, oxidation takes place at the:

13 In the electrochemical series, elements are arranged according to their:

14 A metal placed higher in the activity/electrochemical series (more negative ) tends to act as a:

15 The EMF of a galvanic cell is calculated as:

16 The instrument commonly used for accurate measurement of cell EMF without drawing current is the:

17 The Nernst equation for a cell reaction at 298 K is written as:

18 For the electrode at 298 K, the value of used in the Nernst equation is:

19 The relationship between the standard Gibbs free energy change and standard cell EMF is:

20 The electrical double layer (HDL) that gives rise to single electrode potential forms at the interface between:

21 A conductivity cell filled with KCl (specific conductance ) shows a resistance of . What is the cell constant?

22 The cell constant of a conductivity cell is defined as:

23 A solution has specific conductance and concentration . What is its molar conductance?

24 The resistance of a solution is in a cell with cell constant . What is the molar conductance?

25 How does molar conductance of a strong electrolyte vary with dilution?

26 Which of the following is a weak electrolyte?

27 According to Kohlrausch's law, the limiting molar conductivity of an electrolyte is:

28 The conductance of an electrolytic solution is related to resistance as:

29 In a galvanic cell, oxidation occurs at the anode which is designated as:

30 Which statement correctly distinguishes an electrolytic cell from a galvanic cell?

31 Based on the electrochemical series, which metal is the strongest reducing agent?

32 A metal can displace another metal from its salt solution if the displacing metal has a:

33 The standard EMF of the cell given and is:

34 The EMF of a cell is best measured using a potentiometer rather than a voltmeter because:

35 For the electrode at , the Nernst equation is:

36 The electrode potential of a hydrogen electrode at (with ) at is:

37 For the Daniell cell at , if , the cell EMF equals:

38 The relationship between standard cell EMF and standard Gibbs free energy change is:

39 For a cell with and , the standard free energy change () is approximately:

40 The Helmholtz Double Layer (HDL) at a metal-solution interface arises due to:

41 A conductivity cell filled with KCl (specific conductance ) shows a resistance of . When filled with an unknown electrolyte, the resistance is . What is the specific conductance of the unknown solution?

42 The molar conductance of acetic acid is and . Calculate the dissociation constant .

43 For the cell with , the cell EMF at is:

44 A cell has and for a 2-electron reaction. The entropy change at is (F = 96500 C):

45 Using standard reduction potentials , , , which species can oxidize spontaneously?

46 The EMF of the concentration cell is at . The ratio is:

47 For a cell reaction with and at , the equilibrium constant is approximately:

48 The resistance of a solution in a cell of cell constant is . The molar conductance in is:

49 The electrical double layer (Helmholtz double layer) at a metal-solution interface primarily gives rise to:

50 Which condition must be satisfied for an electrochemical cell to be thermodynamically reversible?

51 In an electrolytic cell used for electroplating, the correct assignment of electrode signs and processes is:

52 A potentiometer is preferred over a voltmeter for measuring cell EMF because:

53 For the half-cell , . Keeping all other concentrations at unity, the electrode potential when (at ) is:

54 For a galvanic cell, . If and , the enthalpy change is:

55 The molar conductance of a strong electrolyte increases slightly with dilution, whereas that of a weak electrolyte increases sharply. The best explanation is:

56 The limiting molar conductance of can be obtained from of , , and using Kohlrausch's law as:

57 For the cell , and measured at . The pH of the anode solution is:

58 The cell constant of a conductivity cell has SI units of because it equals:

59 The Daniell cell operating with a finite current is best classified as behaving:

60 During electrolysis of molten , a current of is passed for . The mass of Na deposited at the cathode is (Na = 23, F = 96500 C):