Electrochemistry is an important branch of chemistry that deals with the relationship between electricity and chemical reactions. It plays a key role in various applications, such as batteries, electroplating, corrosion prevention, and industrial processes. For students in Class 12, understanding electrochemistry is crucial not only for board exams but also for competitive exams like JEE and NEET.
This topic involves concepts like redox reactions, electrode potentials, electrolysis, and the working of electrochemical cells. To master these concepts, practicing Multiple Choice Questions (MCQs) is highly beneficial. MCQs provide a quick way to test your knowledge, improve accuracy, and enhance problem-solving skills.
In electrochemistry, you will learn about galvanic cells, which generate electricity through chemical reactions, and electrolytic cells, where electricity drives non-spontaneous reactions. Key laws like Faraday’s Laws of Electrolysis, the Nernst Equation, and the concept of standard electrode potential form the backbone of this topic. MCQs based on these concepts test your understanding of the theory as well as your ability to solve numerical problems.
One major advantage of practicing MCQs is that it helps you identify common mistakes and strengthens your grasp of core ideas. The questions often include tricky options to test your conceptual clarity, so it’s essential to read carefully and think critically. MCQs also provide exposure to a variety of questions, from basic definitions to complex problem-solving scenarios.
For students preparing for board exams, electrochemistry typically carries significant weightage in the chemistry syllabus. Practicing MCQs ensures you are well-prepared to tackle both theoretical and numerical questions efficiently. Additionally, for competitive exams, these questions are designed to challenge your speed and accuracy, two vital skills for success.
In this collection of MCQs on Electrochemistry for Class 12 Chemistry, we have included questions covering all the important subtopics. From understanding the working of cells and electrodes to applying formulas for solving numerical problems, this set of questions is aimed at helping you prepare thoroughly.
By solving these MCQs, you can boost your confidence, clarify doubts, and enhance your preparation. Remember, consistent practice and a strong understanding of the concepts are the keys to excelling in electrochemistry. Dive into these questions and take a step closer to mastering this fascinating and practical topic!
Do Check: Electrochemistry Class 12 Notes Chemistry Chapter 3
Class 12 Electrochemistry MCQs
Ques 1. What happens when one end of a metal plate is heated?
(a) The resistance of the metal increases
(b) Electrons carry energy to the other end
(c) Atoms shift to the other end
(d) Energy creates small vibrations in the atoms
Answer: (b) Electrons carry energy to the other end
Ques 2. Fused NaCl on electrolysis produces __________ at the cathode.
(a) Sodium
(b) Chlorine
(c) Hydrogen
(d) Sodium amalgam
Answer: (a) Sodium
Ques 3. The conductivity of electrolytic solutions is due to:
(a) Movement of ions
(b) Free electrons
(c) Atomic vibrations
(d) None of these
Answer: (a) Movement of ions
Ques 4. How many coulombs are required to reduce 1 mole of Cr₂O₇²⁻ in acidic medium?
(a) 4 × 96500
(b) 6 × 96500
(c) 2 × 96500
(d) 1 × 96500
Answer: (b) 6 × 96500
Ques 5. Which material cannot store ZnCl₂ solution?
(a) Aluminum
(b) Gold
(c) Lead
(d) Silver
Answer: (a) Aluminum
Ques 6. Which is NOT an electrochemical cell?
(a) Voltaic cell
(b) Fuel cell
(c) Photovoltaic cell
(d) Electrolytic cell
Answer: (c) Photovoltaic cell
Do Check: NCERT Solutions for Class 12 Chemistry Chapter 3 – Electrochemistry
Ques 7. In a dry cell, which substance acts as the electrolyte?
(a) Ammonium chloride
(b) Potassium hydroxide
(c) Manganese dioxide
(d) Sulfuric acid
Answer: (a) Ammonium chloride
Ques 8. In a fuel cell, what is supplied at the cathode?
(a) Oxygen
(b) Hydrogen
(c) Nitrogen
(d) Chlorine
Answer: (a) Oxygen
Ques 9. The reaction 3ClO⁻ → ClO₃⁻ + 2Cl⁻ is an example of:
(a) Oxidation
(b) Reduction
(c) Disproportionation
(d) Decomposition
Answer: (c) Disproportionation
Ques 10. The easiest metal to oxidize from +2 to +3 state is:
(a) Chromium (Cr)
(b) Manganese (Mn)
(c) Iron (Fe)
(d) Cobalt (Co)
Answer: (a) Chromium (Cr)
Ques 11. Electrolysis is the process of:
(a) Breaking an electrolyte with electricity
(b) Conducting electricity in metals
(c) Generating power using fuel
(d) Transferring energy using light
Answer: (a) Breaking an electrolyte with electricity
Ques 12. Which of the following is true about lead-acid batteries?
(a) The anode is made of lead
(b) The cathode is lead dioxide
(c) Sulfuric acid is the electrolyte
(d) All of the above
Answer: (d) All of the above
Ques 13. The standard reduction potentials of X, Y, Z are 0.52, -3.03, and -1.18 V. The reducing power order is:
(a) Y > Z > X
(b) X > Z > Y
(c) Z > X > Y
(d) Z > Y > X
Answer: (a) Y > Z > X
Do Check: Electrochemistry Viva Questions with Answers
Ques 14. Which statement about a cathode is true?
(a) Reduction occurs here
(b) It attracts electrons
(c) It can be positive or negative
(d) All of the above
Answer: (d) All of the above
Ques 15. A fuel cell uses __________ as its fuel.
(a) Hydrogen
(b) Oxygen
(c) Nitrogen
(d) Argon
Answer: (a) Hydrogen
Ques 16. How much charge is needed to deposit 1 mole of aluminum from AlCl₃?
(a) 3 F
(b) 1 F
(c) 0.33 F
(d) 2 F
Answer: (a) 3 F
Ques 17. The molar conductivity of 0.15 M KCl solution at 298 K with conductivity 0.0152 S cm⁻¹ is:
(a) 101 Ω⁻¹ cm² mol⁻¹
(b) 124 Ω⁻¹ cm² mol⁻¹
(c) 204 Ω⁻¹ cm² mol⁻¹
(d) 300 Ω⁻¹ cm² mol⁻¹
Answer: (a) 101 Ω⁻¹ cm² mol⁻¹
Ques 18. A primary cell:
(a) Cannot be recharged
(b) Uses mercury as an example
(c) Has irreversible reactions
(d) All of the above
Answer: (d) All of the above
Ques 19. The electrolyte in a dry cell is:
(a) Ammonium chloride
(b) Zinc chloride
(c) Sodium hydroxide
(d) Potassium chloride
Answer: (a) Ammonium chloride
Do Check: NCERT Exemplar Solutions for Class 12 Chemistry Chapter 3 – Electrochemistry
Ques 20. What is produced at the cathode in a fuel cell?
(a) Water
(b) Hydrogen
(c) Oxygen
(d) Carbon dioxide
Answer: (a) Water
Ques 21. What is used to create a salt bridge?
(a) KNO₃
(b) NaCl
(c) ZnCl₂
(d) HCl
Answer: (a) KNO₃
Ques 22. Which is true about electrochemical cells?
(a) Cell potential is intensive
(b) Gibbs free energy is extensive
(c) Both are correct
(d) None of these
Answer: (c) Both are correct
Ques 23. Which has the highest conductivity in water?
(a) 0.1 M difluoroacetic acid
(b) 0.1 M fluoroacetic acid
(c) 0.1 M acetic acid
(d) 0.1 M chloroacetic acid
Answer: (a) 0.1 M difluoroacetic acid
Ques 24. Standard solution of KNO₃ is used in a salt bridge because:
(a) K⁺ and NO₃⁻ move at similar speeds
(b) It dissolves well in water
(c) It prevents mixing of solutions
(d) Both (a) and (b)
Answer: (d) Both (a) and (b)
Ques 25. Which reaction type involves the same element undergoing oxidation and reduction?
(a) Disproportionation
(b) Decomposition
(c) Oxidation
(d) Reduction
Answer: (a) Disproportionation
