Electrochemical Cell Multiple Choice Questions and Answers

1. The oxidation number of sulphur in Caro’s acid is
  1. +4
  2. +5
  3. +6
  4. +8

Answer: +6

2. An electrochemical cell generally consists of a cathode and an anode. Which of the following statements is correct with respect to the cathode?
  1. Oxidation occurs at the cathode
  2. Electrons move into the cathode
  3. Usually denoted by a negative sign
  4. Is usually made up of insulating material

Answer: Electrons move into the cathode

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3. Which of the following is not a characteristic feature of a salt bridge?
  1. Salt bridge joins the two halves of an electrochemical cell
  2. It completes the inner circuit
  3. It is filled with a salt solution (or gel)
  4. It does not maintain electrical neutrality of the electrolytic solutions of the half-cells

Answer: It does not maintain electrical neutrality of the electrolytic solutions of the half-cells

4. What is the observation when the opposing external applied potential to an electrochemical cell is greater than the cell’s potential?
  1. The electrochemical cell behaves like an electrolytic cell
  2. The electrochemical cell stops functioning
  3. Only oxidation reactions occur in the cell
  4. Only reduction reactions occur in the cell

Answer: The electrochemical cell behaves like an electrolytic cell

5. The electrochemical cell stops working after sometime. Why ?
  1. Increase in temperature
  2. The difference of cell potentials of both electrodes become zero.
  3. By reversing the direction of reaction taking place in the cell.
  4. Due to change in concentration

Answer: The difference of cell potentials of both electrodes become zero.

6. The solution of silver nitrate become coloured when pieces of nickle are added to solution of silver nitrate because
  1. Nickel is oxidised
  2. Silver is oxidised
  3. Nickel is reduced
  4. Silver is precipitated

Answer: Nickel is oxidised

7. Which is the device used for measurement of electrical resistance ?
  1. Voltmeter
  2. Wheatstone bridge
  3. Galvanometer
  4. Ammeter

Answer: Wheatstone bridge

8. The reaction of electrochemical cell will stop after sometime because _____
  1. potential of both electrodes becomes zero.
  2. potential of both electrodes becomes equal.
  3. one of the electrode is completely corroded.
  4. reaction will occur in opposite direction.

Answer: one of the electrode is completely corroded.

9. The electricity conducted by 1 mole electron is called _____
  1. 1 Joule
  2. 1 volt
  3. 1 Faraday
  4. 1 coulomb

Answer: 1 Faraday

10. Electrolytes conduct electric current
  1. by the movement of ions
  2. by the movement of atoms
  3. by the movement of molecules
  4. by the movement of electrons from the cathode to anode

Answer: by the movement of electrons from the cathode to anode

11. The conductance in electrolyte conductors is due to
  1. Either movement of electrons or ions
  2. The flow of free mobile electrons
  3. Movement of ions
  4. None of the above

Answer: Movement of ions

12. When equilibrium is reached inside the two half-cells of the electrochemical cells, what is the net voltage across the electrodes?
  1. 100 lit
  2. < 1
  3. = 0
  4. Not defined

Answer: = 0

13. Which of the following statements is correct regarding Electrochemical cells?
  1. Cell potential is an extensive property
  2. Cell potential is an intensive property
  3. The Gibbs free energy of an electrochemical cell is an intensive property
  4. Gibbs free energy is undefined for an electrochemical cell

Answer: Cell potential is an intensive property

14. Which of the following is not a type of electrochemical cell?
  1. Voltaic cell
  2. Photovoltaic cell
  3. Electrolytic cell
  4. Fuel Cell

Answer: Photovoltaic cell

15. Which of the following statements regarding primary cells is false?
  1. Primary cells cannot be recharged
  2. They have low internal resistance
  3. They have an irreversible chemical reaction
  4. Their initial cost is cheap

Answer: They have low internal resistance

16. Which cell differs from principle point of view?
  1. Storage cell
  2. Electrolytic cell
  3. Fuel cell
  4. Leclanche cell

Answer: Electrolytic cell

17. The values of standard reduction potential of X, Y and Z metals are 0.34 V, 0.80 V and -0.45 V. Mention their order of strength as reducing agent
  1. Z > Y > X
  2. Z > X > Y
  3. X > Y > Z
  4. Y > Z > X

Answer: Z > X > Y

18. Which of the following cell is different ?
  1. Daniel cell
  2. Voltaic cell
  3. Galvanic cell
  4. Electrolytic cell

Answer: Electrolytic cell

19. Which of the following is the most powerful reducing agent?
  1. H2S
  2. H2SO3
  3. SnCl2
  4. HNO2

Answer: H2S

20. The cell constant of a conductivity cell
  1. Changes with a change of concentration of electrolyte
  2. Remains constant for a cell
  3. changes with a change of electrolyte
  4. changes with change in temperature

Answer: Remains constant for a cell

21. Why are the saturated solutions of electrolytes for the salt bridge prepared in agar-agar jelly or gelatin?
  1. The jelly acts as an electrolyte
  2. It helps the electrolytes to mix with the contents of the half cells
  3. It helps maintain the electrical polarity between the two half-cell solutions
  4. It keeps the electrolyte in semi-solid phase and prevents it from mixing with the two half-cell solutions

Answer: It keeps the electrolyte in semi-solid phase and prevents it from mixing with the two half-cell solutions

22. Which of the following is a not a secondary cell?
  1. Nickel-cadmium cell
  2. Lead storage cell
  3. Mercury cell
  4. Leclanche cell

Answer: Leclanche cell

23. Which reaction take place in electrochemical cell ?
  1. Oxidation
  2. Reduction
  3. Redox
  4. All the given

Answer: All the given

24. The resistance of any uniform conductor is
  1. in inverse proportion to its length
  2. in direct proportion to its length
  3. in the inverse proportion of the square of its area of cross section
  4. in direct proportion of the area of its cross section

Answer: in direct proportion to its length

25. What will be the mole ratio of Cu, Ag and Al respectively, when 1 mole electrons passed through CuSO4, AgNO3 and AlCl3 solution ?
  1. 1 : 1 : 1
  2. 1 : 2 : 3
  3. 2 : 1 : 3
  4. 3 : 6 : 2

Answer: 3 : 6 : 2

26. What is the direction of flow of electrons in an electrolytic cell?
  1. Anode to cathode externally
  2. Anode to cathode internally
  3. Cathode to anode externally
  4. Cathode to anode in the solution

Answer: Anode to cathode externally

27. What is used for the measurement of accurate potential of electrochemical cell ?
  1. Galvanometer
  2. Ammeter
  3. Voltmeter
  4. Potentiometer

Answer: Potentiometer

28. Which is more corroded when the iron plates of steamers are connected with block of Zn metal and kept in contact of sea water ?
  1. Iron
  2. Zinc
  3. Both
  4. Neither of the metals

Answer: Zinc

29. For the cell reaction takes place in electrochemical cell-
  1. ΔG = 0
  2. ΔG < 0
  3. ΔG > 0
  4. ΔG ≥ 1

Answer: ΔG < 0

30. Which of the following substances can act as both oxidising and reducing agent?
  1. KMnO4
  2. K2Cr2O7
  3. HNO3
  4. H2O2

Answer: H2O2

31. The reductant may be defined as a substance, whose oxidation no of the atom
  1. increases
  2. decreases
  3. remains constant
  4. may increases or decreases

Answer: increases

32. Which of the following is not a generally used electrolyte in the salt bridges used to connect the two half-cells of an electrochemical cell?
  1. NaCl
  2. KNO3
  3. KCl
  4. ZnSO4

Answer: ZnSO4

33. Oxygen has a +2 oxidation state in
  1. H2O
  2. H2O2
  3. F2O
  4. SO2

Answer: F2O

34. When the salt bridge is removed from a cell, its voltage
  1. will increase
  2. will decrease to half
  3. Fwill decrease to zero2O
  4. will not change

Answer: will decrease to zero

35. 1 Faraday _____ Coulomb.
  1. 96000
  2. 96487
  3. 96847
  4. 96748

Answer: 96487

36. Which of the following is not an example of an oxidizing agent?
  1. hydrogen peroxide
  2. potassium dichromate
  3. nitric acid
  4. hydrogen sulphide

Answer: hydrogen sulphide

37. At which temperatures ceramic materials are known as superconductor ?
  1. 0 K
  2. 200 K
  3. 150 K
  4. 15 K

Answer: 150 K

38. When a dilute solution of H2SO4 is electrolysed using a platinum electrode, at anode the gas evolved is
  1. SO3
  2. SO2
  3. H2
  4. O2

Answer: O2

ADRE 3.0 Complete Study Material