Chemistry - Electrochemistry
Practise 23 WBJEE previous year questions on Electrochemistry, compiled from papers spanning 2010 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 WBJEE tests.
Electrochemistry has been asked in 14 of the 18 years of WBJEE papers analysed (2009–2026), with 23 questions in all. 26% of them were easy, 70% moderate and 4% tough. Most of its questions came from 2014, with 4 questions that year. In the last three years (2024–2026) it had 3 questions across 3 papers, about 1 per paper.
The chapter's 3 topics are not weighted equally: Cells and Electrode Potential, Nernst Equation (12 questions, 52%), Conductance and Conductivity (10 questions, 43%), and Concentration cell (1 question, 4%) have been asked the most. Over the last five years the most frequent topics have been Conductance and Conductivity (4). Conductance and Conductivity has produced the most tough questions (1).
- 1In a conductance experiment, aqueous solution is added to aqueous solution gradually and simultaneously the molar conductivity is measured. 2026Conductance and Conductivity
- 2The molar conductances of and at infinite dilution are and respectively. The molar conductance of at infinite dilution will be2025Conductance and Conductivity
- 3The specific conductance \(( {k})\) of \(0.02( {M})\) aqueous acetic acid solution at 298 K is \(1.65 10^{-4} {~S} {~cm}^{-1}\). The degree 2024Conductance and Conductivity
- 4The equivalent conductance of \( {NaCl}, {HCl}\) and \( {CH}_3 {COONa}\) at infinite dilution are \(126.45,426.16\) and 91 \( {ohm}^{-1} {~c2023Conductance and Conductivity
- 5The reduction potential of hydrogen half-cell will be negative if2021Cells and Electrode Potential, Nernst Equation
- 6The charge carried by 1 millimole of ions is 193 coulombs. The value of is2019Cells and Electrode Potential, Nernst Equation
- 7If electrolysis of aqueous CuSO solution is carried out using Cu-electrodes, the reaction taking place at the anode is2019Concentration cell
- 8What amount of clectricity can deposit I mole of Al metal at cathode when passed through molten2018Cells and Electrode Potential, Nernst Equation
- 9Given the standard half-cell potentials of the following as Then the standard e.m.f. of the cell with the reaction is2018Cells and Electrode Potential, Nernst Equation
- 10The order of equivalent conductances at infinite dilution for LiCl, and is2016Conductance and Conductivity
- 11At a particular temperature. the ratio of equivalent conductance to specific conductance of a 0.01 N NaCl solution is2015Conductance and Conductivity
- 12At temperature of , the emf of the following electrochemical cell. will be (Given, call )2015Cells and Electrode Potential, Nernst Equation
- 13The quantity of electricity needed to separately electrolyze 1 M solution of , and completely is in the ratio of2014Cells and Electrode Potential, Nernst Equation
- 14electrochemical cell is given as . The value of cell EMF will be2014Cells and Electrode Potential, Nernst Equation
- 15At , the molar conductance of hydrofluoric acid is 150 mho and its mho The value of the dissociation constant of the acid at the given conce2014Conductance and Conductivity
- 16The formal potential of in a sulphuric acid and phosphoric acid mixture is much lower than the standard potential . This is due to2014Cells and Electrode Potential, Nernst Equation
- 17The correct order of equivalent conductances at infinite dilution in water at room temperature for and ions is2013Conductance and Conductivity
- 18A conductivity cell has been calibrated with electrolyte solution (specific conductance, ) in the cell and the measured resistance was at Th2013Conductance and Conductivity
- 19Equivalent conductivity at infinite dilution for sodium-potassium oxalate will be [given molar conductivities of oxalate, and ions at infini2013Conductance and Conductivity
- 20Li occupies higher position in the electrochemical series of metals as compared to Cu since2012Cells and Electrode Potential, Nernst Equation
- 21On passing 'C ampere of current for time 't' sec through 1 L of 2 (M) solution (atomic weight of ), the amount of Cu (in gram) deposited on 2012Cells and Electrode Potential, Nernst Equation
- 22The standard reduction potential \( {E}^{ }\) for half reations are \( {array}{ll} {Zn}= {Zn}^{+2}+ {Ze} & {E}^{ }=+0.76 {~V} \\ {Fe}= {Fe}^2011Cells and Electrode Potential, Nernst Equation
- 23The potential of a hydrogen electrode at is2010Cells and Electrode Potential, Nernst Equation
Frequently Asked Questions
1.How many questions are available for Electrochemistry?
This chapter includes 23 questions compiled from WBJEE papers spanning 2010 to 2026.
2.Are these questions only from WBJEE, or from other exams too?
These are WBJEE 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 WBJEE Chemistry?
Electrochemistry has appeared in 14 of the 18 years of WBJEE papers covered here, with 23 questions across 14 papers - about 2 per paper it appears in.
4.What is the difficulty level of Electrochemistry questions in WBJEE?
Of the 23 questions analysed for this chapter, 26% are easy, 70% moderate and 4% tough. 2014 had the most, with 4 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 - 12 questions (52%)
- Conductance and Conductivity - 10 questions (43%)
- Concentration cell - 1 question (4%)
- Conductance and Conductivity has produced the most tough questions (1).
6.Is Electrochemistry's weightage in WBJEE going up or down?
Across all 14 papers analysed, Electrochemistry has averaged about 1.6 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.