NCERT MCQ Solutions for Class 12 Chemistry Chapter 2 Electrochemistry

NCERT MCQ Solutions for Class 12 Chemistry Chapter 2 Electrochemistry for new session 2025-26. NCERT MCQs give a clear, accurate answers with step-by-step explanations for all multiple-choice questions based on chapter 2. These solutions cover key topics such as galvanic and electrolytic cells, Nernst equation, conductivity, Faraday’s laws and Gibbs energy relations. Designed to match board exam and competitive exam standards, they help students build conceptual clarity, improve problem-solving speed and gain confidence in applying formulas correctly. Ideal for daily practice and exam preparation.
Class 12 Chemistry MCQ Solutions
Class 12 All Subjects MCQs

Class 12 Chemistry Chapter 2 MCQ Solutions

Q1. A galvanic cell converts

[A]. Chemical energy into electrical energy
[B]. Electrical energy into light energy
[C]. Chemical energy into heat energy
[D]. Electrical energy into chemical energy

Q2. In a galvanic cell, the electrode where oxidation takes place is called

[A]. Anode and it is positively charged
[B]. Cathode and it is negatively charged
[C]. Anode and it is negatively charged
[D]. Cathode and it is positively charged

Q3. The standard electrode potential (E°) is defined with respect to the standard hydrogen electrode (SHE), which is assigned a potential of

[A]. 1.10 V
[B]. 0.00 V
[C]. 1.00 V
[D]. -1.00 V

Q4. The Nernst equation relates the electrode potential (E) to

[A]. Only the Faraday constant
[B]. Only the temperature
[C]. Only the standard electrode potential (E°)
[D]. Standard electrode potential (E°), temperature and concentration of species

Class 12 Chemistry Chapter 2 MCQ with Answers

Q5. For a spontaneous cell reaction, the standard Gibbs energy change (ΔᵣG°) is

[A]. Negative
[B]. Zero
[C]. Positive
[D]. Equal to RT

Q6. The unit of electrical resistance (R) is

[A]. Ohm meter (Ω m)
[B]. Ohm (Ω)
[C]. Siemens (S)
[D]. Siemens per meter (S/m)

Q7. Conductivity (κ) is defined as the inverse of

[A]. Molar conductivity (Λₘ)
[B]. Conductance (G)
[C]. Resistivity (ρ)
[D]. Resistance (R)

Q8. Molar conductivity (Λₘ) is related to conductivity (κ) and concentration (c) by the equation

[A]. Λₘ = κ/c
[B]. Λₘ = κ + c
[C]. Λₘ = κ × c
[D]. Λₘ = c/κ

Class 12 Chemistry Chapter 2 Objective Questions

Q9. How does the conductivity (κ) of an electrolytic solution generally change with dilution?

[A]. Decreases
[B]. Increases
[C]. Remains constant
[D]. First increases then decreases

Q10. How does the molar conductivity (Λₘ) of a strong electrolyte change with dilution?

[A]. Decreases slowly
[B]. Increases sharply
[C]. Decreases sharply
[D]. Increases slowly

Q11. Kohlrausch’s law of independent migration of ions applies to

[A]. Resistivity at infinite dilution
[B]. Conductivity at any concentration
[C]. Limiting molar conductivity (Λ°ₘ)
[D]. Molar conductivity at any concentration

Q12. According to Faraday’s first law of electrolysis, the amount of chemical reaction at an electrode is proportional to

[A]. The time elapsed
[B]. The quantity of electricity passed
[C]. The voltage applied
[D]. The resistance of the solution
Class 12 Chemistry Chapter 2 MCQ in Concepts for Board Exams

Multiple Choice Questions from Chapter 2 of Class 12 Chemistry, Electrochemistry, are useful for deepening conceptual clarity. Class 12 Chemistry Chapter 2 MCQs involve key topics like electrochemical and electrolytic cells, Nernst equation, standard electrode potentials and the relation between Gibbs energy and cell emf. Questions may ask students to identify spontaneous reactions, predict product formation or calculate emf using the Nernst equation. MCQs help reinforce the understanding of abstract scientific ideas like electrode potential, ionic conductance and redox processes. Practising MCQs enables students to avoid common errors, like confusing the anode and cathode roles in galvanic vs electrolytic cells. Since board exams now integrate competency-based MCQs, students must be quick in identifying the correct scientific principles and applying formulas accurately. Regular practice not only builds accuracy and confidence but also ensures students are fully prepared for application and concept-based questions under time constraints.

Q13. One Faraday (F) represents the charge on

[A]. One mole of electrons
[B]. One mole of a substance
[C]. One ampere flowing for one second
[D]. One electron

Q14. During the electrolysis of aqueous NaCl using inert electrodes, what is produced at the cathode?

[A]. O₂(g)
[B]. Cl₂(g)
[C]. Na(s)
[D]. H₂(g) and OH⁻(aq)

Q15. Which type of battery cannot be recharged?

[A]. Nickel-cadmium cell
[B]. Primary battery
[C]. Secondary battery
[D]. Lead storage battery

Q16. In the lead storage battery commonly used in cars, the electrolyte is

[A]. Paste of KOH and ZnO
[B]. Paste of NH₄Cl and ZnCl₂
[C]. Concentrated NaOH solution
[D]. 38% solution of sulphuric acid (H₂SO₄)
Class 12 Chemistry Chapter 2 MCQs for Competitive Exams

MCQs from Electrochemistry play a major role in competitive exams. These exams test not just memory, but analytical thinking and the ability to apply theory under pressure. Class 12 Chemistry Chapter 2 Objective Question covers formula-intensive topics like molar conductivity, Kohlrausch’s Law, Faraday’s Laws and quantitative electrolysis all of which are common in MCQ formats. For example, candidates may be required to determine the product of electrolysis or calculate equilibrium constants using the Nernst equation. These questions demand clear understanding of unit conversions, electrochemical conventions and reaction stoichiometry. Regular practice of MCQs helps students master the stepwise logic needed to solve complex problems quickly and accurately. It also exposes them to commonly twisted options, improving their precision. Since the subject overlaps with thermodynamics, kinetics and equilibrium, MCQs from Class 12 Chemistry Chapter 2 also prepare students for integrated questions. Thus, MCQ practice in Electrochemistry is key to excelling in both boards and competitive tests.

Q17. A fuel cell is a galvanic cell designed to convert the energy of

[A]. Combustion of fuels directly into electricity
[B]. Radioactive decay into electricity
[C]. Mechanical motion into electricity
[D]. Light into electricity

Q18. The rusting of iron is an electrochemical process that requires the presence of

[A]. Only water
[B]. Only oxygen
[C]. Water and air (oxygen)
[D]. Water and carbon dioxide

Q19. Sacrificial protection against corrosion involves

[A]. Coating the metal with a less reactive metal
[B]. Coating the metal with a more reactive metal
[C]. Painting the metal surface
[D]. Applying an external current

Q20. In the equation ΔᵣG° = -nFE°ₖₑₗₗ, ‘n’ represents

[A]. Number of ions produced
[B]. Number of moles of electrolyte
[C]. Number of moles of electrons transferred in the balanced cell reaction
[D]. Avogadro’s number

Why should students practice MCQs from Class 12 Chemistry Chapter 2?

Practising MCQs from Class 12 Chemistry Chapter 2 helps students grasp difficult concepts such as electrode potentials, Nernst equation and electrolysis. These questions test quick decision-making, formula application and concept clarity. Since MCQs are a part of the board exam pattern and heavily tested in entrance exams like JEE and NEET, consistent practice is crucial. It boosts confidence, improves time management and minimizes errors in choosing between closely-worded options. It also ensures readiness for both theoretical and numerical-based problems.

What are the most important topics to focus on for MCQs in Chapter 2 Electrochemistry?

Key areas for MCQs in this chapter include types of electrochemical cells (galvanic and electrolytic), standard electrode potentials, Nernst equation applications, Faraday’s laws of electrolysis and conductivity-related concepts like molar conductivity and Kohlrausch’s Law. Numerical-based questions on emf calculations, cell representation and Gibbs free energy often appear. Students should also be prepared for conceptual questions involving electrode reactions, oxidation-reduction and comparisons between different ions’ reducing or oxidizing strength.

How can I effectively prepare for Class 12 Chemistry Chapter 2 MCQ-based questions?

To prepare effectively, begin by thoroughly understanding each concept from the NCERT textbook. Make formula sheets for emf, conductance and Gibbs energy. Practice MCQs regularly from sample papers, previous year questions and standard reference books. Attempt topic-wise MCQ quizzes and time-bound tests to enhance speed and accuracy. Pay special attention to tricky concepts like electrode conventions and unit conversions. Lastly, revise frequently to retain concepts and identify weak areas for targeted improvement.