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Saturday, 10 October

JEE Main Chemistry · Class 12

Electrochemistry: JEE Main previous year questions

Electrochemistry had 46 questions in the 42 JEE Main shifts Lumi analysed, about 1.0 a shift, asked in 38 of 42 shifts. It ranks 14 of 30 Chemistry chapters by questions; 20% of its questions were hard.

Questions
46
in 38 of 42 shifts
A shift, on average
1.0
of 25 Chemistry questions
Since 2024
+0.1
0.9 a shift in 2017–23, 1.0 in 2024–26
Numerical answer
23
50% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
05101’174’204’215’225’239’2410’258’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20171
  • 20204
  • 20214
  • 20225
  • 20235
  • 20249
  • 202510
  • 20268
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

5 topics and 17 distinct ideas; 6 ideas were asked more than once. Most questions are numerical value and calculation.

Topics, by questions

15 questions had no close topic in our taxonomy and are counted for the chapter only.

Ideas asked most
6 repeat

Study it on Lumi

Electrochemistry: the interactive lesson

Every question

All 46 Electrochemistry questions

Newest first. Each opens with its options and the official answer.

2026 8 questions

  1. 2 Apr 2026, Shift 1 · Q57An electrochemical cell is constructed using half cells in the direction of spontaneous change…MediumSingle correct
  2. 2 Apr 2026, Shift 2 · Q73Consider the following two half-cell reactions along with the standard reduction potential given:…HardNumerical value
  3. 4 Apr 2026, Shift 2 · Q73An electrochemical cell, consist of the following two redox couples, Mx+(aq)/M(s)\mathrm{M^{x+}(aq)/M(s)} [Ered⊖=+0.15 V][E^\ominus_{red}=+0.15\ \mathrm{V}] and…HardNumerical value
  4. 5 Apr 2026, Shift 2 · Q57One half cell in a voltaic cell is constructed by dipping silver rod in AgNO3\mathrm{AgNO_3} solution of unknown concentration, other half…MediumSingle correct
  5. 5 Apr 2026, Shift 2 · Q74At 298 K, the molar conductivity of x%x\% (w/w) MX solution (aqueous) is 123.5 S cm2^2 mol−1^{-1}. The conductance of same solution is…MediumNumerical value
  6. 6 Apr 2026, Shift 1 · Q58Consider the following data. Electrolyte | Λm∘\Lambda^\circ_m (S cm2^2 mol−1^{-1}) BaCl2\mathrm{BaCl_2} | x1x_1 H2SO4\mathrm{H_2SO_4} | x2x_2…HardSingle correct
  7. 6 Apr 2026, Shift 2 · Q57For a general redox reaction Anode : Red1→Ox1n1++n1e−\mathrm{Red_1\rightarrow Ox_1^{n_1+}+n_1e^-} Cathode :…MediumOtherHas a figure
  8. 8 Apr 2026, Shift 2 · Q56Given at 298 K : EFe2+/Fe⊖=XE^{\ominus}_{\mathrm{Fe^{2+}/Fe}} = X Volt EFe3+/Fe⊖=YE^{\ominus}_{\mathrm{Fe^{3+}/Fe}} = Y Volt The…MediumSingle correct

2025 10 questions

  1. 2 Apr 2025, Shift 1 · Q71Consider the following electrochemical cell at standard condition. Au(s)∣QH2,Q∣NH4X(0.01 M)∣∣Ag+(1 M)∣Ag(s)\mathrm{Au(s)|QH_2,Q|NH_4X(0.01\ M)||Ag^+(1\ M)|Ag(s)}…HardNumerical valueHas a figure
  2. 2 Apr 2025, Shift 2 · Q720.2%0.2\% (w/v) solution of NaOH is measured to have resistivity 870.0 mΩ m870.0\ \mathrm{m\Omega\ m}. The molar conductivity of the solution will…MediumNumerical value
  3. 3 Apr 2025, Shift 1 · Q56Correct order of limiting molar conductivity for cations in water at 298 K is :MediumSingle correct
  4. 3 Apr 2025, Shift 2 · Q5540 mL of a mixture of CH3COOH\mathrm{CH_3COOH} and HCl (aqueous solution) is titrated against 0.1 M NaOH solution conductometrically. Which of…HardSingle correctHas a figure
  5. 3 Apr 2025, Shift 2 · Q56The standard cell potential (Ecell⊖\mathrm{E^{\ominus}_{cell}}) of a fuel cell based on the oxidation of methanol in air that has been used to…MediumSingle correct
  6. 4 Apr 2025, Shift 2 · Q72The molar conductance of an infinitely dilute solution of ammonium chloride was found to be 185 S cm2 mol−1185\ \mathrm{S\,cm^2\,mol^{-1}} and the…MediumNumerical value
  7. 7 Apr 2025, Shift 1 · Q55Given below are two statements: Statement I: Mohr's salt is composed of only three types of ions-ferrous, ammonium and sulfate. Statement…MediumTwo statements
  8. 7 Apr 2025, Shift 1 · Q711 Faraday electricity was passed through Cu2+\mathrm{Cu^{2+}} (1.5 M, 1 L) /Cu and 0.1 Faraday was passed through Ag+\mathrm{Ag^+} (0.2 M, 1…HardNumerical valueHas a figure
  9. 7 Apr 2025, Shift 2 · Q56Given below are two statements : 1 M aqueous solutions of each of Cu(NO3)2\mathrm{Cu(NO_3)_2}, AgNO3\mathrm{AgNO_3}, Hg2(NO3)2\mathrm{Hg_2(NO_3)_2},…MediumTwo statements
  10. 8 Apr 2025, Shift 2 · Q75Consider the following half cell reaction Cr2O72−(aq)+6e−+14H+(aq)⟶2Cr3+(aq)+7H2O(l)\mathrm{Cr_2O_7^{2-}(aq) + 6e^- + 14H^+(aq) \longrightarrow 2Cr^{3+}(aq) + 7H_2O(l)} The…MediumNumerical value

2024 9 questions

  1. 6 Apr 2024, Shift 2 · Q65How can an electrochemical cell be converted into an electrolytic cell ?EasySingle correct
  2. 9 Apr 2024, Shift 1 · Q64The molar conductivity for electrolytes A and B are plotted against C1/2C^{1/2} as shown below. Electrolytes A and B respectively are :EasySingle correctHas a figure
  3. 9 Apr 2024, Shift 1 · Q85The standard reduction potentials at 298 K for the following half cells are given below :…MediumNumerical value
  4. 9 Apr 2024, Shift 2 · Q64Match List I with List II List I (Cell) | List II (Use/Property/Reaction) A. Leclanche cell | I. Converts energy of combustion into…EasyMatch the list
  5. 9 Apr 2024, Shift 2 · Q65Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for a weak…MediumSingle correct
  6. 29 Jan 2024, Shift 1 · Q86The mass of zinc produced by the electrolysis of zinc sulphate solution with a steady current of 0.015 A for 15 minutes is ________…EasyNumerical value
  7. 30 Jan 2024, Shift 2 · Q65Reduction potential of ions are given below: ClO4−\mathrm{ClO_4^-} E∘=1.19 VE^\circ = 1.19\ V; IO4−\mathrm{IO_4^-} E∘=1.65 VE^\circ = 1.65\ V;…EasySingle correct
  8. 31 Jan 2024, Shift 1 · Q64Identify the factor from the following that does not affect electrolytic conductance of a solution.EasySingle correct
  9. 31 Jan 2024, Shift 1 · Q85One Faraday of electricity liberates x×10−1x\times10^{-1} gram atom of copper from copper sulphate. xx is _________.EasyNumerical value

2023 5 questions

  1. 6 Apr 2023, Shift 1 · Q67The standard electrode potential of M+/M\mathrm{M^+/M} in aqueous solution does not depend onMediumSingle correct
  2. 8 Apr 2023, Shift 2 · Q86The number of incorrect statements from the following is ____________ A. The electrical work that a reaction can perform at constant…MediumNumerical value
  3. 11 Apr 2023, Shift 1 · Q86In an electrochemical reaction of lead, at standard temperature, if E∘(Pb2+/Pb)=m\mathrm{E^{\circ}(Pb^{2+}/Pb)} = m Volt and…MediumNumerical value
  4. 13 Apr 2023, Shift 2 · Q69The correct group of halide ions which can be oxidised by oxygen in acidic medium isMediumSingle correct
  5. 13 Apr 2023, Shift 2 · Q86At 298 K, the standard reduction potential for Cu2+/Cu\mathrm{Cu^{2+}/Cu} electrode is 0.34 V. Given :…HardNumerical value

2022 5 questions

  1. 25 Jul 2022, Shift 1 · Q84The cell potential for Zn∣Zn2+(aq)∥Snx+∣ Sn\mathrm{Zn|Zn^{2+}(aq)\|Sn^{x+}|\,Sn} is 0.8010.801 V at 298 K. The reaction quotient for the above reaction is…MediumNumerical value
  2. 28 Jul 2022, Shift 1 · Q63Match List - I with List - II. List - I | List - II (A) Cd(s)+2Ni(OH)3(s)→CdO(s)+2Ni(OH)2(s)+H2O(l)\mathrm{Cd(s)+2Ni(OH)_3(s)\to CdO(s)+2Ni(OH)_2(s)+H_2O(\mathit{l})} | (I)…MediumMatch the list
  3. 28 Jul 2022, Shift 1 · Q70Which of the following has least tendency to liberate H2\mathrm{H_2} from mineral acids ?EasySingle correct
  4. 24 Jun 2022, Shift 1 · Q84The cell potential for the following cell Pt ∣H2(g)∣H+(aq)∥ Cu2+(0.01 M)∣Cu(s)\mathrm{Pt\,|H_2(g)|H^+(aq)\|\ Cu^{2+}(0.01\ M)|Cu(s)} is 0.576 V at 298 K. The pH of the…MediumNumerical value
  5. 29 Jun 2022, Shift 1 · Q84A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total…MediumNumerical value

2021 4 questions

  1. 3 Aug 2021, Shift 2 · Q56The potential of a cell containing two hydrogen electrodes, one in contact with 10−810^{-8} M H+\mathrm{H^+} concentration and the other in…MediumNumerical value
  2. 25 Jul 2021, Shift 1 · Q58Consider the cell at 25∘^\circC Zn∣Zn2+(aq),(1 M) ∣∣ Fe3+(aq),Fe2+(aq)∣Pt(s)\mathrm{Zn|Zn^{2+}(aq),(1\ M)\,||\,Fe^{3+}(aq),Fe^{2+}(aq)|Pt(s)} The fraction of total iron present as…HardNumerical value
  3. 16 Mar 2021, Shift 2 · Q57A 5.0 m mol dm−3\mathrm{dm^{-3}} aqueous solution of KCl has a conductance of 0.55 mS when measured in a cell of cell constant 1.3…MediumNumerical value
  4. 18 Mar 2021, Shift 1 · Q56For the reaction 2Fe3+(aq)+2I−(aq)→2Fe2+(aq)+I2(s)\mathrm{2Fe^{3+}(aq) + 2I^-(aq) \rightarrow 2Fe^{2+}(aq) + I_2(s)} the magnitude of the standard molar free energy…HardNumerical value

2020 4 questions

  1. 8 Jan 2020, Shift 1 · Q48What would be the electrode potential for the given half cell reaction at pH=5 ? ______.…MediumNumerical value
  2. 9 Jan 2020, Shift 2 · Q28Amongst the following, the form of water with the lowest ionic conductance at 298 K is :EasySingle correct
  3. 2 Sep 2020, Shift 1 · Q47The Gibbs energy change (in J) for the given reaction at [Cu2+]=[Sn2+]=1[\mathrm{Cu^{2+}}]=[\mathrm{Sn^{2+}}]=1 M and 298 K is :…EasyNumerical value
  4. 6 Sep 2020, Shift 2 · Q45For the given cell ; Cu(s)∣Cu2+(C1 M)∣∣Cu2+(C2 M)∣Cu(s)\mathrm{Cu(s)|Cu^{2+}(C_1\ M)||Cu^{2+}(C_2\ M)|Cu(s)} change in Gibbs energy (ΔG\Delta G) is negative, if :MediumSingle correct

2017 1 questions

  1. 2 Apr 2017 (offline) · Q36Given ECl2/Cl−∘=1.36E^\circ_{\mathrm{Cl_2/Cl^-}}=1.36 V, ECr3+/Cr∘=−0.74E^\circ_{\mathrm{Cr^{3+}/Cr}}=-0.74 V ECr2O72−/Cr3+∘=1.33E^\circ_{\mathrm{Cr_2O_7^{2-}/Cr^{3+}}}=1.33 V,…EasySingle correct

Pattern: Asked most years.