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Chemistry - Electrochemistry

Practise 236 JEE Main previous year questions on Electrochemistry, compiled from papers spanning 2002 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 JEE Main tests.

Electrochemistry has been asked in 25 of the 25 years of JEE Main papers analysed (2002–2026), with 236 questions in all. 23% of them were easy, 52% moderate and 25% tough. Most of its questions came from 2024, with 29 questions that year. In the last three years (2024–2026) it had 66 questions across 49 papers, about 1.3 per paper.

The chapter's 6 topics are not weighted equally: Cells and Electrode Potential, Nernst Equation (150 questions, 64%), Conductance and Conductivity (55 questions, 23%), and Commercial Cells and Batteries (12 questions, 5%) have been asked the most. Cells and Electrode Potential, Nernst Equation has also led over the last five years, with 72 questions. Cells and Electrode Potential, Nernst Equation has produced the most tough questions (34).

  1. 1Given at K: Volt; Volt. The in Volt at K is given by:08 Apr, 2026 (E)Cells and Electrode Potential, Nernst Equation
  2. 2Consider the following data. Electrolyte (S cm mol ) HCl is sparingly soluble in water. If the conductivity of the saturated solution is S c06 Apr, 2026 (M)Conductance and Conductivity
  3. 3For a general redox reaction Anode : Cathode : Which of the following statement is incorrect ?06 Apr, 2026 (E)Cells and Electrode Potential, Nernst Equation
  4. 4One half cell in a voltaic cell is constructed by dipping silver rod in solution of unknown concentration, other half cell is rod dipped in 05 Apr, 2026 (E)Cells and Electrode Potential, Nernst Equation
  5. 5At , the molar conductivity of (w/w) solution (aqueous) is . The conductance of same solution is . The value of is _______ . (Given : cell c05 Apr, 2026 (E)Conductance and Conductivity
  6. 6An electrochemical cell, consist of the following two redox couples, and . The cell EMF is recorded to be V. If the reaction quotient of the04 Apr, 2026 (E)Cells and Electrode Potential, Nernst Equation
  7. 7An electrochemical cell is constructed using half cells in the direction of spontaneous change V and V Which of the following option is corr02 Apr, 2026 (M)Cells and Electrode Potential, Nernst Equation
  8. 8Consider the following two half-cell reactions along with the standard reduction potential given: V V A fuel cell was set up using the above02 Apr, 2026 (E)Commercial Cells and Batteries
  9. 9Consider the following redox reaction taking place in acidic medium If the Nernst equation for the above balanced reaction is , then the val28 Jan, 2026 (M)Cells and Electrode Potential, Nernst Equation
  10. 10For strong electrolyte increases slowly with dilution and can be represented by the equation Molar conductivity values of the solutions of s28 Jan, 2026 (E)Conductance and Conductivity
  11. 11A volume of of solution was mixed with of solution to make an electrolytic buffer. If the same buffer was used in the following electrochemi28 Jan, 2026 (E)Cells and Electrode Potential, Nernst Equation
  12. 12Electricity is passed through an acidic solution of till all the was exhausted, leading to the deposition of 300 mg of Cu metal. However, a 24 Jan, 2026 (M)Cells and Electrode Potential, Nernst Equation
  13. 13Molar conductivity of a weak acid HQ of concentration 0.18 M was found to be of the molar conductivity of another weak acid HZ with concentr24 Jan, 2026 (E)Conductance and Conductivity
  14. 14In the given electrochemical cell, at 298 K, the cell potential will increase when : A. Concentration of is increased. B. Concentration of i23 Jan, 2026 (M)Cells and Electrode Potential, Nernst Equation
  15. 15Consider the above electrochemical cell where a metal electrode (M) is undergoing redox reaction by forming . The cation is present in two d23 Jan, 2026 (E)Concentration cell
  16. 16Consider the following electrochemical cell at 298 K . If the reaction quotient at a given time is , then the cell EMF ( ) is (Nearest integ22 Jan, 2026 (M)Cells and Electrode Potential, Nernst Equation
  17. 17Consider the following reduction processes : The tendency to act as reducing agent decreases in the order :22 Jan, 2026 (E)Cells and Electrode Potential, Nernst Equation
  18. 18Consider the following electrochemical cell : The pH above which, oxygen gas would start to evolve at anode is (nearest integer). standard r22 Jan, 2026 (E)Cells and Electrode Potential, Nernst Equation
  19. 19The pH and conductance of a weak acid (HX) was found to be 5 and , respectively. The conductance was measured under standard condition using21 Jan, 2026 (M)Conductance and Conductivity
  20. 20For a closed circuit Daniell cell, which of the following plots is the accurate one at a given temperature?21 Jan, 2026 (E)Cells and Electrode Potential, Nernst Equation
  21. 21MX is a sparingly soluble salt that follows the given solubility equilibrium at 298 K. If the standard reduction potential for is , then the21 Jan, 2026 (E)Cells and Electrode Potential, Nernst Equation
  22. 22Consider the following half cell reaction The reaction was conducted with the ratio of . The pH value at which the EMF of the half cell will08 Apr, 2025 (E)Cells and Electrode Potential, Nernst Equation
  23. 23Faraday electricity was passed through and Faraday was passed through electrolytic cells. After this the two cells were connected as shown b07 Apr, 2025 (M)Cells and Electrode Potential, Nernst Equation
  24. 24Given below are two statements : Statement I : Mohr's salt is composed of only three types of ions-ferrous, ammonium and sulphate. Statement07 Apr, 2025 (M)Conductance and Conductivity
  25. 25Given below are two statements : 1 M aqueous solution of each of , are electrolysed using inert electrodes, Statement (I) : With increasing 07 Apr, 2025 (E)Cells and Electrode Potential, Nernst Equation
  26. 26On charging the lead storage battery, the oxidation state of lead changes from to at the anode and from to at the cathode. The values of are04 Apr, 2025 (M)Commercial Cells and Batteries
  27. 27The molar conductance of an infinitely dilute solution of ammonium chloride was found to be and the ionic conductance of hydroxyl and chlori04 Apr, 2025 (E)Conductance and Conductivity
  28. 28Correct order of limiting molar conductivity for cations in water at 298 K is :03 Apr, 2025 (M)Conductance and Conductivity
  29. 29The standard cell potential of a fuel cell based on the oxidation of methanol in air that has been used to power television relay station is03 Apr, 2025 (E)Cells and Electrode Potential, Nernst Equation
  30. 3040 mL of a mixture of and HCl (aqueous solution) is titrated against 0.1 M NaOH solution conductometrically. Which of the following statemen03 Apr, 2025 (E)Conductance and Conductivity
  31. 31Consider the following electrochemical cell at standard condition. \( {aligned} & {Au}( {s}) | {QH}_2, {Q} | {NH}_4 {X}(0.01 {M})| | {Ag}^{+02 Apr, 2025 (M)Cells and Electrode Potential, Nernst Equation
  32. 32solution of NaOH is measured to have resistivity . The molar conductivity of the solution will be ______ . (Nearest integer)02 Apr, 2025 (E)Conductance and Conductivity
  33. 33The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected t29 Jan, 2025 (M)Conductance and Conductivity
  34. 34The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.29 Jan, 2025 (M)Cells and Electrode Potential, Nernst Equation
  35. 35For a \( {Mg} | {Mg}^{2+}( {aq}) | | {Ag}^{+}( {aq}) | {Ag}\) the correct Nernst Equation is :29 Jan, 2025 (M)Cells and Electrode Potential, Nernst Equation
  36. 36gas will be evolved as a product of electrolysis of : (A) an aqueous solution of using silver electrodes. (B) an aqueous solution of using p29 Jan, 2025 (E)Concentration cell
  37. 37Match List - I with List - II : \( {array}{llll} & { List - I } & { List - II } \\ & { Applications } & { Batteries } / { Cell } \\ { (A) } 29 Jan, 2025 (E)Commercial Cells and Batteries
  38. 38Given below is the plot of the molar conductivity vs for KCl in aqueous solution. If, for the higher concentration of KCl solution, the resi28 Jan, 2025 (M)Conductance and Conductivity
  39. 39Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution to 12 . The current in Amperes used for the given e28 Jan, 2025 (E)Cells and Electrode Potential, Nernst Equation
  40. 40For the given cell The standard cell potential of the above reaction is Given:24 Jan, 2025 (M)Cells and Electrode Potential, Nernst Equation
  41. 41Based on the data given below : the strongest reducing agent is :24 Jan, 2025 (E)Cells and Electrode Potential, Nernst Equation
  42. 42In the above diagram, the standard electrode potentials are given in volts (over the arrow). The value of is23 Jan, 2025 (M)Cells and Electrode Potential, Nernst Equation
  43. 43Standard electrode potentials for a few half cells are mentioned below : Which one of the following cells gives the most negative value of ?23 Jan, 2025 (E)Cells and Electrode Potential, Nernst Equation
  44. 44A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A . The amount of the aluminium deposited at the cathod22 Jan, 2025 (M)Cells and Electrode Potential, Nernst Equation
  45. 45Given below are two statements : Statement (I) : Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure 22 Jan, 2025 (E)Corrosion
  46. 46The molar conductivity for electrolytes \(A\) and \(B\) are plotted against \(C^{1 / 2}\) as shown below. Electrolytes \(A\) and \(B\) respe09 Apr, 2024 (M)Conductance and Conductivity
  47. 47The standard reduction potentials at \(298 {~K}\) for the following half cells are given below : \( {array}{ll} {Cr}_2 {O}_7^{2-}+14 {H}^{+}09 Apr, 2024 (M)Cells and Electrode Potential, Nernst Equation
  48. 48Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for a weak electrolyte, 09 Apr, 2024 (E)Conductance and Conductivity
  49. 49Match List I with List II \( {array}{|l|l|l|l|} & { List - I (Cell) } & & {List - II (Use/Property/Reaction)} \\ { A. } & { Leclanche cell }09 Apr, 2024 (E)Commercial Cells and Batteries
  50. 50The emf of cell Tl \( | {(0.001 {M})}{ {Tl}^{+}} | | {(0.01 {M})}{ {Cu}^{2+}} | {Cu}\) is \(0.83 {~V}\) at \(298 {~K}\). It could be increas08 Apr, 2024 (E)Cells and Electrode Potential, Nernst Equation

Frequently Asked Questions

1.How many questions are available for Electrochemistry?

This chapter includes 236 questions compiled from JEE Main papers spanning 2002 to 2026.

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

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

3.Is Electrochemistry an important chapter for JEE Main Chemistry?

Electrochemistry has appeared in 25 of the 25 years of JEE Main papers covered here, with 236 questions across 178 papers - about one per paper it appears in.

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

Of the 236 questions analysed for this chapter, 23% are easy, 52% moderate and 25% tough. 2024 had the most, with 29 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 - 150 questions (64%)
  • Conductance and Conductivity - 55 questions (23%)
  • Commercial Cells and Batteries - 12 questions (5%)
  • Cells and Electrode Potential, Nernst Equation has produced the most tough questions (34).
6.Is Electrochemistry's weightage in JEE Main going up or down?

Across all 178 papers analysed, Electrochemistry has averaged about 1.3 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.