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Chemistry - Electrochemistry

Practise 85 COMEDK previous year questions on Electrochemistry, compiled from papers spanning 2012 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty COMEDK tests.

Electrochemistry has been asked in 14 of the 15 years of COMEDK papers analysed (2012–2026), with 85 questions in all. 15% of them were easy, 72% moderate and 13% tough. Most of its questions came from 2025, with 19 questions that year. In the last three years (2024–2026) it had 48 questions across 10 papers, about 4.8 per paper.

The chapter's 4 topics are not weighted equally: Cells and Electrode Potential, Nernst Equation (53 questions, 62%), Conductance and Conductivity (23 questions, 27%), and Commercial Cells and Batteries (7 questions, 8%) have been asked the most. Cells and Electrode Potential, Nernst Equation has also led over the last five years, with 36 questions. Cells and Electrode Potential, Nernst Equation has produced the most tough questions (10).

  1. 1g of Fe gets deposited when an aqueous solution of Ferric sulphate is electrolysed for 20 minutes using a current of "x" amperes. Find "x". 09 May, 2026 (S1)Cells and Electrode Potential, Nernst Equation
  2. 2Consider a Galvanic cell in which the following reactions occurs: . What is the standard potential of the cell? Given: , &09 May, 2026 (S1)Cells and Electrode Potential, Nernst Equation
  3. 3What will be the change in the electrode potential of chromium electrode dipping into chromic sulphate solution, when the electrolyte is dil09 May, 2026 (S1)Cells and Electrode Potential, Nernst Equation
  4. 4Identify the correct mathematical expression which represents the variation in molar conductivity of a weak acid having concentration C and 09 May, 2026 (S1)Conductance and Conductivity
  5. 5Two statements, one Assertion and the other Reason are given. Choose the right option. Assertion: The Molar conductivity of KCl increases ve09 May, 2026 (S1)Conductance and Conductivity
  6. 6Which of the following is always true about a spontaneous cell reaction in a galvanic cell?09 May, 2026 (S2)Cells and Electrode Potential, Nernst Equation
  7. 7The G for the reaction, is:09 May, 2026 (S2)Cells and Electrode Potential, Nernst Equation
  8. 8Resistance of 0.2 M solution of an electrolyte is 50 . The conductivity of the solution is 1.3 Sm . If the resistance of 0.4 M solution of t09 May, 2026 (S2)Conductance and Conductivity
  9. 9Using the data given below, the strongest reducing agent is: V V V V09 May, 2026 (S2)Cells and Electrode Potential, Nernst Equation
  10. 10The quantity of Ca that can be produced from molten CaCl , with the same quantity of electricity (in coulombs) required to produce 4.8 g of 09 May, 2026 (S2)Cells and Electrode Potential, Nernst Equation
  11. 11A current of 0.10 A was passed for 2 hours through a dilute solution of sulphuric acid. The total volume of gaseous products produced at STP25 May, 2025 (Shift)Cells and Electrode Potential, Nernst Equation
  12. 12Identify the two statements which are incorrect regarding Corrosion of Iron. A. During electrical protection of underground Iron pipes from 25 May, 2025 (Shift)Corrosion
  13. 13Consider the cell At 298 K , the emf of the cell is 0.31 V . The pH of the acidic solution is 3 . The concentration of is:25 May, 2025 (Shift)Cells and Electrode Potential, Nernst Equation
  14. 14In the reaction, The standard emf of the cell is: Given:25 May, 2025 (Shift)Cells and Electrode Potential, Nernst Equation
  15. 15The variation of the molar conductivity with concentration of an electrolyte in aqueous solution is shown in the given figure. The electroly25 May, 2025 (Shift)Conductance and Conductivity
  16. 16The EMF of the cell is 1.209 V . The EMF of the cell can be increased by ------------------------------10 May, 2025 (S1)Cells and Electrode Potential, Nernst Equation
  17. 17The conductivity of 0.01 M solution of at 298 K is What is the value of the acid if and are and respectively?10 May, 2025 (S1)Conductance and Conductivity
  18. 18What is the reduction potential of a half-cell consisting of a Pt electrode dipped in and solution where the reaction taking place is conver10 May, 2025 (S1)Cells and Electrode Potential, Nernst Equation
  19. 19A current of 2.5 amperes is passed through 800 ml of 0.48 M solution of for 1.0 hour with a current efficiency of . If the volume of the sol10 May, 2025 (S1)Cells and Electrode Potential, Nernst Equation
  20. 20What is the standard electrode potential at 298 K for the reaction: ? Given:10 May, 2025 (S2)Cells and Electrode Potential, Nernst Equation
  21. 21What would be the cell potential for the Galvanic cell which is represented by the electrochemical reaction:10 May, 2025 (S2)Cells and Electrode Potential, Nernst Equation
  22. 22Two statements, one Assertion and the other Reason are given. Choose the correct option. Assertion: For strong electrolytes the plot of Mola10 May, 2025 (S2)Conductance and Conductivity
  23. 23A current of 1.5 A is passed for 2 hours through an aqueous solution of where X is a monovalent anion. During the electrolysis process 2.97710 May, 2025 (S2)Cells and Electrode Potential, Nernst Equation
  24. 24The Standard Reduction potential at 25°C for is +1.49 V. The values for four redox couples: (a). , (b). , (c). and (d). are +1.81 V, –0.74 V10 May, 2025 (S2)Cells and Electrode Potential, Nernst Equation
  25. 25Identify the two incorrect electrochemical reactions shown as taking place in the given cells at the respective electrodes. Cell Electrode R10 May, 2025 (S3)Commercial Cells and Batteries
  26. 26When of KCl was filled in a Conductivity cell the resistance was 80 ohms at 298 K . (Conductivity of 0.1 M KCl at 298 K is . The same cell w10 May, 2025 (S3)Conductance and Conductivity
  27. 27For a cell the cell . When is and is 0.1 atm , the EMF of the cell becomes +1.57 V . Calculate the pH of the electrochemical cell.10 May, 2025 (S3)Cells and Electrode Potential, Nernst Equation
  28. 28For the cell reaction at 298 K , the cell . What would be the (Equilibrium constant) value if the reverse reaction were to take place?10 May, 2025 (S3)Cells and Electrode Potential, Nernst Equation
  29. 29Two statements, one Assertion and the other Reason, are given. Choose the correct option. Assertion: During the electrolysis of aqueous is l10 May, 2025 (S3)Cells and Electrode Potential, Nernst Equation
  30. 30undergoes disproportionation, according to the equation, The value for the reaction is:2024 (Afternoon Shift)Cells and Electrode Potential, Nernst Equation
  31. 31The limiting molar conductivity of is . At , molar conductance of aqueous solution of ammonium hydroxide is . The degree of ionisation of at2024 (Afternoon Shift)Conductance and Conductivity
  32. 32The values of and are given. Which element/(s) is/(are) good for coating the surface of iron to prevent corrosion? Given:2024 (Afternoon Shift)Cells and Electrode Potential, Nernst Equation
  33. 33Identify the incorrect statement among the following.2024 (Afternoon Shift)Conductance and Conductivity
  34. 34When 0.1 mole of is oxidised, the quantity of electricity required to completely oxidise to is2024 (Afternoon Shift)Cells and Electrode Potential, Nernst Equation
  35. 35A dry cell consists of a moist paste of and contained in a casing which encloses a Carbon rod surrounded by black paste. What is the role of2024 (Evening Shift)Commercial Cells and Batteries
  36. 36Arrange the following redox couples in the increasing order of their reducing strength:2024 (Evening Shift)Cells and Electrode Potential, Nernst Equation
  37. 37What is the quantity of charge, in Faraday units, required for the reduction of 3.5 moles of in acid medium?2024 (Evening Shift)Cells and Electrode Potential, Nernst Equation
  38. 38Given below are 2 statements: Assertion and Reason. Choose the correct option. Assertion: When Molar conductivity for a strong electrolyte i2024 (Evening Shift)Conductance and Conductivity
  39. 39A current of 3.0A is passed through 750 ml of 0.45 M solution of CuSO for 2 hours with a current efficiency of 90%. If the volume of the sol2024 (Evening Shift)Cells and Electrode Potential, Nernst Equation
  40. 40Identify the correct statement regarding corrosion of iron rod left exposed to atmosphere.2024 (Evening Shift)Corrosion
  41. 41A dilute solution of sulphuric acid is electrolysed using a current of 0.20 A for 4 hours to produce hydrogen and oxygen gas. The total volu2024 (Memory Based)Conductance and Conductivity
  42. 423 Faraday of electricity is passed through three electrolytic cells connected in series containing and ions respectively. The molar ratio in2024 (Memory Based)Commercial Cells and Batteries
  43. 43The gibbs free energy change for above mention reaction at NTP is . The value of is [Nearest integer] Given2024 (Memory Based)Cells and Electrode Potential, Nernst Equation
  44. 44What would be the EMF of the cell in which the following reaction occurs:2024 (Morning Shift)Cells and Electrode Potential, Nernst Equation
  45. 45solution of is taken in a Conductivity cell and a potential difference of is applied across the ends of a column of this solution whose diam2024 (Morning Shift)Conductance and Conductivity
  46. 46Given below are 4 equations showing Molar conductivities at infinite dilution of various electrolytes. Which one of them represents the corr2024 (Morning Shift)Conductance and Conductivity
  47. 47Propane in presence of gas undergoes complete combustion to produce and . The required for this combustion reaction was produced by the elec2024 (Morning Shift)Cells and Electrode Potential, Nernst Equation
  48. 48Match the chemical reactions taking place at the Anode of the cell with the correct cell in which the reaction occurs. No. Anodic Reaction N2024 (Morning Shift)Commercial Cells and Batteries
  49. 49If electrolysis of water is carried out for a time duration of 2 hours, how much electric current in amperes would be required to liberate o2023 (Evening Shift)Cells and Electrode Potential, Nernst Equation
  50. 50The reaction taking place in a galvanic cell is as given The emf of the cell is . If the standard emf of the cell is , what is the value of 2023 (Evening Shift)Cells and Electrode Potential, Nernst Equation

Frequently Asked Questions

1.How many questions are available for Electrochemistry?

This chapter includes 85 questions compiled from COMEDK papers spanning 2012 to 2026.

2.Are these questions only from COMEDK, or from other exams too?

These are COMEDK questions specifically for the Electrochemistry chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Electrochemistry an important chapter for COMEDK Chemistry?

Electrochemistry has appeared in 14 of the 15 years of COMEDK papers covered here, with 85 questions across 23 papers - about 4 per paper it appears in.

4.What is the difficulty level of Electrochemistry questions in COMEDK?

Of the 85 questions analysed for this chapter, 15% are easy, 72% moderate and 13% tough. 2025 had the most, with 19 questions.

5.Which topics in Electrochemistry should I focus on?

These topics have carried the most weightage in Electrochemistry:

  • Cells and Electrode Potential, Nernst Equation - 53 questions (62%)
  • Conductance and Conductivity - 23 questions (27%)
  • Commercial Cells and Batteries - 7 questions (8%)
  • Cells and Electrode Potential, Nernst Equation has produced the most tough questions (10).
6.Is Electrochemistry's weightage in COMEDK going up or down?

Across all 23 papers analysed, Electrochemistry has averaged about 3.7 questions per paper. In the last three years (2024–2026), that average has risen, at about 4.8 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.