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Multiple-choice Questions
Q.1. The effect of temperature increases on concentration is as follows:
- Metallic conduction increases, electrolytic conduction decreases
- electrolytic conduction increases, metallic conduction decreases
- Both metallic and electrolytic conduction decreases
- Both metallic and electrolytic conduction increases
Answer: electrolytic conduction increases, metallic conduction decreases
Q.2. The units of equivalent conductance are:
- ohm−1
- ohm−1 cm−2
- ohm−1 cm2
- mho cm2
Answer: ohm−1 cm2
Q.3. The cell constant is
- \frac{1}{a}
- \frac{a}{1}
- a\times 1
- \frac{K}{R}
Answer: \frac{1}{a}
Q.4. The effect of dilution on conduction is as follows:
- Specific conductance increases, molar conductance decreases
- Specific conductance decreases, molar conductance increases
- Both increases with dilution
- Both decreases with dilution
Answer: Specific conductance decreases, molar conductance increases
Q.5. The units of the cell constant is
- cm−1
- cm2
- cm3
- cm−2
Answer: cm−1
Q.6. The potential of a single electrode is a half cell is called as
- Reduction potential
- Half-wave potential
- Single electrode potential
- Cell potential
Answer: Reduction potential
Q.7. Which of the following constitutes Daniel Cell?
- Zn − Ag cell
- Cu − Ag cell
- Zn − Cu cell
- none of these
Answer: Zn − Cu cell
Q.8. EMF of a cell in terms of the reduction potential of its left and right electrode
- E = Eleft + Eright
- E = Eleft − Eright
- E = Eright − Eleft
- None of these
Answer: E = Eright − Eleft
Q.9. Which of the following is a secondary cell
- Dry cell
- Mercury cell
- Ni–Cd cell
- H2–O2 cell
Answer: Ni-Cd cell
Q.10. An electrochemical cell stops working after some time because
- One of the electrodes is eaten away
- electrode potentials of both electrodes becomes equal in magnitude
- electrode potentials of both the electrodes go on decreasing
- electrode potentials of both the electrodes go on increasing
Answer: electrode potentials of both electrodes becomes equal in magnitude
Q.11. The standard EMF (E°) for the cell reaction
Zn + Cu2+ → Zn2+ + Cu is 1.1 volt at 25 °C. The EMF(E) of the cell reaction when 0.1M Cu2+ and 0.1 M Zn2+ solutions are used, at 25 °C is
- 1.10 V
- 0.10 V
- −1.10 V
- −0.110 V
Answer: 1.10 V
Q.12. In an electrochemical cell
- Potential energy decreases
- Kinetic energy decreases
- Potential energy changes into electrical energy
- Chemical energy changes into electrical energy
Answer: Chemical energy changes into electrical energy
Q.13. As lead storage battery is charged
- lead dioxide dissolves
- sulphuric acid is regenerated
- lead electrode becomes coated with lead sulphate
- the concentration of sulphuric acid decreases
Answer: sulphuric acid is regenerated
Q.14. In an electrochemical series, electrodes are arranged in the
- Increasing order (downwards) of standard reduction potential
- Decreasing order of standard reduction potential
- Increasing order of standard oxidation potential
- Increasing order of equivalent weight
Answer: Increasing order (downwards) of standard reduction potential
Q.15. The electrode potential of standard calomel electrode is
- 0.2422 V
- 0.2400 V
- 0.2810 V
- 0.3335 V
Answer: 0.2422 V
Q.16. Silver – Silver chloride electrode is a type of
- Redox electrode
- Metal – Metal Ion electrodes
- Metal – Amalgam electrode
- Gas – ion electrode
Answer: Metal – Metal Ion electrodes
Q.17. Calomel electrode consists of calomel with a solution of
- Saturated NaCl
- Saturated Ca (OH)2
- Saturated KCl
- Saturated AgCl
Answer: Saturated KCl
Q.18. Which electrode is used for pH measurement
- Silver electrode
- Redox electrode
- Glass electrode
- Calomel electrode
Answer: Glass electrode
Q.19. Lachance cell is an example of
- Primary cell
- Secondary cell
- Tertiary cell
- Fuel cell
Answer: Primary cell
Q.20. A fuel cell converts
- Chemical energy into electrical energy
- Chemical energy into potential energy
- Chemical energy into heat
- Chemical energy into pressure
Answer: Chemical energy into electrical energy
Q.21. Which is produced during H2−O2 fuel cell
- CH3OH
- H2O
- H2O2
- H3O+
Answer: H2O
Q.22. The cathode of Ni-Cd cell is made up from
- NiOH
- Ni (OH)2
- NiO2
- NiO (OH)
Answer: NiO (OH)
Q.23. During Charging of lead-acid cell, the concentration of H2SO4
- Increases
- Decreases
- Remains unchanged
- First increases then decreases
Answer: Increases
Q.24. In a potentiometric titration, the graph is plotted between variations of
- Electrode potential with temperature of titrant
- Electrode potential with pressure of titrant
- Electrode potential with volume of titrant
- Electrode potential with concentration of titrant
Answer: Electrode potential with the volume of titrant
Q.25. At equilibrium, the EMF of the cell is
- 0 V
- 100 V
- Less than 0 V
- More than 0 V
Answer: 0 V
Q.26. In glass electrode, the glass membrane undergoes exchange of Na+ ion with
- Ca2+
- Mg2+
- H+
- NH4+
Answer: H+
Q.27. Quinhydrone – electrode consist of hydroquinone (QH2) and quinone (Q) in the ratio of
- 1: 2
- 1:1
- 2:1
- 1:15
Answer: 1:1
Q.28. The conductance of an electrode depends upon
- Number of free ions present in solution
- Number of free ions present in solvent
- Concentration of the solution
- Temperature of the solution
Answer: Number of free ions present in solution
Q.29. Four metals A, B, C, and D are having their reduction potentials as −3.05, −1.66, −0.40, and −0.80 V respectively. Which one of these will be the most reducing agent.
- A
- B
- C
- D
Answer: A
Q.30. Equivalent conductance of NaCl, HCl, and C2H5COONa at infinite dilution are 126.45, 426.16, and 91 ohm−1 cm2 respectively. The equivalent conductance of C2H5COOH at infinite dilution is
- 201.28 ohm−1 cm2
- 390.71 ohm−1 cm2
- 698.28 ohm−1 cm2
- 540.48 ohm−1 cm2
Answer: 390.71 ohm−1 cm2
Q.31. The saturated solution of KNO3 is used to make salt bridges because
- Velocity of K+ is greater than that of NO3−
- Velocity of NO3− is greater than that of K+
- Velocities of both K+ and NO3− are nearly the same
- KNO3 is highly soluble in water
Answer: Velocities of both K+ and NO3− are nearly the same
Q.32. The specific conductance of N/50 solution of KCl at 25 °C is 0.002765 ohm−1. If the resistance of the cell is 400 ohms, then what is the value of cell constant
- 2
- 1.106
- 3
- 3.2
Answer: 1.106
Q.33. The EMF of the cell Ni | Ni2+ (1.0M) | Au3+ (1.0M) | Au
Given that
\begin{pmatrix} E^{o}=-0.25V for Ni^{2+}|Ni\\ E^{o}=+1.5V for Au^{3+}|Au \end{pmatrix}- 1.25 V
- −1.25 V
- 1.75 V
- 2.00 V
Answer: 1.75 V
Q.34. The conductivity of a saturated solution of BaSO4 is 3.06 × 10−6 ohm−1 cm2 and its equivalent conductance is 1.53 ohm−1 cm2 equiv−1. The Ksp for BaSO4 will be
- 4 × 10−12
- 2.5 × 10−9
- 2.5 × 10−13
- 4 × 10−6
Answer: 4 × 10−6
Q.35. Which of the following does not conduct electricity
- Molten NaCl
- Aqueous NaCl
- Solid NaCl
- Aqueous NH4Cl
Answer: Solid NaCl
Q.36. On dilution specific conductance of an electrolyte
- Increases
- Decreases
- First increases then decreases
- Neither increases nor decreases
Answer: Decreases
Q.37. The unit of equivalent conductivity is
- Mho
- Ohm –1 cm–1
- Ohm–1 cm–1 equiv –1
- Ohm –1 cm2 equiv –1
Answer: Ohm –1 cm2 equiv –1
Q.38. The cell constant is defined as
- Ratio of distance between electrodes and their area of cross–section
- Ratio of specific conductance to the observed conductance
- Both the above
- None of the above
Answer: Both the above
Q.39. Which of the following statement is incorrect about an electrochemical cell?
- Oxidation occurs at the anode and reduction occurs at the cathode.
- Chemical energy converts into electrical energy and vice versa
- Cell can work indefinitely
- Salt bridge reduces the liquid junction potential of the cell
Answer: Cell can work indefinitely
Q.40. Glass electrode is an example of
- Redox electrode
- Ion-selective electrode
- Metal insoluble salt electrode
- Gas electrode
Answer: Ion-selective electrode
Q.41. A battery that remains in the inactive state and is activated immediately before use is the
- Primary cell
- Secondary cell
- Reserve battery
- Fuel cell
Answer: Reserve battery
Q.42. In a Leclanche cell, the anode is
- Graphite rod
- FeO and Fe(OH)3
- Zinc container
- MnO2 + C
Answer: Zinc container
Q.43. Which of the following is not an alkaline battery?
- Nickel cadmium battery
- Mercury battery
- Zinc– air battery
- Lead acid battery
Answer: Lead acid battery
Q.44. In a solid oxide fuel cell, the electrolyte is
- NaOH or KOH
- Ceramic compounds
- H2SO4
- Liquid phosphoric acid
Answer: Ceramic compounds
Q.45. Which of the following is not a secondary cell?
- Lithium–MnO2 battery
- Lead–acid battery
- Nickel–cadmium battery
- Nickel metal hydride battery
Answer: Lithium–MnO2 battery
Q.46. The specific conductance of a solution is 0.3568 ohm–1cm–1. When placed in a cell, the conductance is 0.0268 ohm–1. The cell constant is
- 1.331cm–1
- 13.31 cm–1
- 0.665 cm–1
- 6.65 cm–1
Answer: 13.31 cm–1