Electrochemistry — JEE Main PYQs & Practice Questions

Electrochemistry is a Chemistry chapter in the JEE Main syllabus. This page brings together 165 previous-year and practice questions on Electrochemistry, organised into 8 topics: Electrochemical Cells, Nernst Equation, Corrosion, Standard Electrode Potential, Electrolysis and Faraday's Laws, Conductance and Conductivity, Kohlrausch's Law and Batteries and Fuel Cells. Most questions come with a step-by-step solution you can work through free in PrepWiser.

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Chapter weightage: how many questions each chapter had per shift in the 2024–26 papers.

Electrochemical Cells

• An electrochemical cell, consist of the following two redox couples…
• A volume of x mL of 5 M NaHCO₃ solution was mixed with 10 mL of 2 M H₂CO₃ solution to…
• How can an electrochemical cell be converted into an electrolytic cell ?
• Consider the following redox reaction taking place in acidic medium BH₄⁻(aq)+ClO₃⁻(aq)→…
• Given at 298 K : E_(Fe²⁺/Fe)⊖=X Volt; E_(Fe³⁺/Fe)⊖=Y Volt The E_(Fe³⁺/Fe²⁺)⊖ in Volt at…
• The number of incorrect statements from the following is ___________. A. The electrical…
• The reaction 1/2 H₂( g)+AgCl(s) ⇌ H⁺(aq)+Cl⁻(aq)+Ag(s) occurs in which of the given…
• Consider the following electrochemical cell : Pt|O₂( g)(1bar)|HCl(aq)∥M²⁺(aq,1.0M)| M(…
• For a closed circuit Daniell cell, which of the following plots is the accurate one at a…
• The reaction; 1/2 H_(2( g))+AgCl₍ₛ₎ → H_((aq))⁺+Cl_((aq))⁻+Ag₍ₛ₎ occurs in which of the…
• The number of correct statements from the following is __________ A. E_(cell) is an…
• An electrochemical cell is constructed using half cells in the direction of spontaneous…
• For the given cell : Cu(s) | Cu²⁺(C₁M) || Cu²⁺(C₂M) | Cu(s) change in Gibbs energy (ΔG)…
• Consider the above electrochemical cell where a metal electrode ( M ) is undergoing…
• One of the commonly used electrode is calomel electrode. Under which of the following…
• For a general redox reaction Anode Red₁→ Ox₁^(n₁⁺)+n₁e⁻ Cathode Ox₂+n₂e⁻→ Red₂^(n₂-)…
• MX is a sparingly soluble salt that follows the given solubility equilibrium at 298 K…
• One half cell in a voltaic cell is constructed by dipping silver rod in AgNO₃ solution…
• Consider the following reduction processes : Al³⁺+3e⁻→ Al( s),E⁰=-1.66 V; Fe³⁺+e⁻→…
• Consider the following electrochemical cell at 298 K…

Nernst Equation

• The logarithm of equilibrium constant for the reaction Pd²⁺+4 Cl⁻ ⇌ PdCl₄²⁻ is…
• The hydrogen electrode is dipped in a solution of pH=3 at 25° C. The potential of the…
• The photoelectric current from Na (Work function, w₀ = 2.3 eV) is stopped by the output…
• The emf of cell Tl|Tl⁺| Cu²⁺ | Cu is 0.83 V at 298 K. It could be increased by :
• Pt(s)|H₂(g)(1 bar)|H + (aq)(1 M)||M³⁺(aq),M + (aq)|Pt(s) The E_(cell) for the given cell…
• For a cell, Cu(s)|Cu²⁺(0.001 M) ∥ Ag⁺(0.01 M)| Ag(s) the cell potential is found to be…
• The equilibrium constant for the reaction Zn(s)+Sn²⁺(aq) ⇌ Zn²⁺(aq)+Sn(s) is 1×10²⁰ at…
• The magnitude of the change in oxidising power of the MnO₄ - /Mn²⁺ couple is x × 10⁻⁴ V…
• The Gibbs change (in J) for the given reaction at [Cu²⁺] = [Sn²⁺] = 1 M and 298K is…
• Cu(s) + Sn²⁺ (0.001M) → Cu²⁺ (0.01M) + Sn(s) The Gibbs free energy change for the above…
• Consider the following half cell reaction Cr₂O₇²⁻ (aq) + 6e⁻ + 14H⁺ (aq) → 2Cr³⁺ (aq) +…
• The potential for the given half cell at 298 K is (-) __________ × 10⁻² V 2 H_((aq))⁺+2…
• An oxidation-reduction reaction in which 3 electrons are transferred has a ΔGº of 17.37…
• At what pH, given half cell MnO₄⁻(0.1 M) | Mn²⁺(0.001 M) will have electrode potential…
• 1 Faraday electricity was passed through Cu²⁺(1.5 M, 1 L) / Cu and 0.1 Faraday was…
• For a Mg | Mg²⁺ (aq) || Ag⁺ (aq) | Ag the correct Nernst Equation is :
• The cell potential for the following cell Pt |H₂(g)|H⁺ (aq)|| Cu²⁺ (0.01 M)|Cu(s) is…
• The ( (∂ E)/(∂ T) )_P of different types of half cells are as follows: A | B | C | D; 1…
• The cell potential for the given cell at 298 K Pt| H₂ (g, 1 bar) | H⁺ (aq) || Cu²⁺ (aq)…
• Assume a cell with the following reaction Cu₍ₛ₎ + 2Ag + (1 × 10⁻³M) → Cu²⁺(0.250M) +…

Corrosion

• Given below are two statements : Statement (I) : Corrosion is an electrochemical…
• Which of the following statements is not correct about rusting of iron?

Standard Electrode Potential

• The standard reduction potentials at 298 K for the following half cells are given below…
• Based on the data given below : E_(Cr₂ O₇²⁻ / Cr³⁺)°=1.33 V, E_(Cl₂ / Cl⁽⁻⁾)°=1.36 V…
• The standard electrode potential (M³⁺/M²⁺) for V, Cr, Mn Co are -0.26 V, -0.41 V, + 1.57…
• Given below are two statements : 1 M aqueous solutions of each of Cu(NO₃)₂, AgNO₃…
• These are physical properties of an element (A) Sublimation enthalpy (B) Ionisation…
• In an electrochemical reaction of lead, at standard temperature, if E⁰( Pb²⁺ / Pb)=m…
• The correct order of reduction potentials of the following pairs is A. Cl₂/Cl⁻ B. I²/I⁻…
• The strongest reducing agent among the following is :
• The standard reduction potential values of some of the p-block ions are given below…
• FeO₄²⁻ →(+2.0 V) Fe³⁺ →(0.8 V) Fe²⁺ →(-0.5 V) Fe⁰ In the above diagram, the standard…
• In 3d series, the metal having the highest M²⁺/M standard electrode potential is :
• Consider the following redox reaction : MnO₄⁻+H⁺+H₂ C₂ O₄ ⇌ Mn²⁺+H₂ O+CO₂ The standard…
• Which one among the following metals is the weakest reducing agent?
• For the reaction 2Fe³⁺(aq) + 2I⁻(aq) → 2Fe²⁺(aq) + I₂(s) the magnitude of the standard…
• For the given reactions Sn²⁺ + 2e⁻ → Sn Sn⁴⁺ + 4e⁻ → Sn the electrode potentials are…
• The standard reduction potentials at 298 K for the following half cells are given below…
• Given that the standard potentials (Eᵒ) of Cu²⁺/Cu and Cu⁺/Cu are 0.34 V and 0.522 V…
• Standard electrode potentials for a few half cells are mentioned below : E_(Cu²⁺ /…
• The standard electrode potential of M⁺ / M in aqueous solution does not depend on
• In a cell, the following reactions take place Fe²⁺ → Fe³⁺ + e -, E_(Fe³⁺/Fe²⁺)ᵒ = 0.77…

Electrolysis and Faraday's Laws

• In the industrial production of which of the following, molecular hydrogen is obtained…
• Which of the following electrolyte can be used to obtain H₂ S₂ O₈ by the process of…
• The quantity of electricity in Faraday needed to reduce 1 mol of Cr₂O₇²⁻ to Cr³⁺ is…
• The amount of charge in F (Faraday) required to obtain one mole of iron from Fe₃ O₄ is…
• Potassium chlorate is prepared by electrolysis of KCl in basic solution as shown by…
• Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution…
• The amount of electricity in Coulomb required for the oxidation of 1 mol of H₂ O to O₂…
• Electricity is passed through an acidic solution of Cu²⁺ till all the Cu²⁺ was…
• The mass of silver (Molar mass of Ag: 108 gmol⁻¹ ) displaced by a quantity of…
• 108 g of silver (molar mass 108 g mol –1 ) is deposited at cathode from AgNO₃(aq)…
• Number of alkanes obtained on electrolysis of a mixture of CH₃ COONa and C₂ H₅ COONa is…
• A solution of Fe₂(SO₄)₃ is electrolyzed for 'x' min with a current of 1.5 A to deposit…
• A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A…
• One Faraday of electricity liberates x × 10⁻¹ gram atom of copper from copper sulphate…
• An acidic solution of dichromate is electrolyzed for 8 minutes using 2A current. As per…
• Potassium chlorate is prepared by the electrolysis of KCl in basic solution 6OH⁻ + Cl⁻ →…
• A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2…
• 0.05 cm thick coating of silver is deposited on a plate of 0.05 m² area. The number of…
• The mass of zinc produced by the electrolysis of zine sulphate solution with a steady…
• Which one of the following statements is correct for electrolysis of brine solution?

Conductance and Conductivity

• The solubility product of a sparingly soluble salt A₂X₃ is 1.1 × 10⁻²³. If specific…
• A conductivity cell with two electrodes (dark side) are half filled with infinitely…
• The resistance of a conductivity cell with cell constant 1.14 cm⁻¹, containing 0.001 M…
• Identify the factor from the following that does not affect electrolytic conductance of…
• The specific conductance of 0.0025 M acetic acid is 5 × 10⁻⁵ S cm⁻¹ at a certain…
• The molar conductivity of a weak electrolyte when plotted against the square root of its…
• 40 mL of a mixture of CH₃ COOH and HCl (aqueous solution) is titrated against 0.1 M NaOH…
• The number of correct statements from the following is _______. (A) Conductivity always…
• The resistivity of a 0.8 M solution of an electrolyte is 5 × 10⁻³ Ω cm. Its molar…
• Amongst the following, the form of water with the lowest ionic conductance at 298 K is :
• Choose the correct representation of conductometric titration of benzoic acid vs sodium…
• The correct order of conductivity of ions in water is :
• The variation of molar conductivity with concentration of an electrolyte (X) in aqueous…
• At 298 K , the molar conductivity of x%(w/w)MX solution (aqueous) is 123.5 S cm² mol⁻¹…
• The resistance of a conductivity cell containing 0.01 M KCl solution at 298 K is 1750 Ω…
• Resistance of a conductivity cell (cell constant 129 m⁻¹) filled with 74.5 ppm solution…
• Given below are two statements : Statement I : The limiting molar conductivity of KCl…
• A 5.0 m mol dm⁻³ aqueous solution of KCl has a conductance of 0.55 mS when measured in a…
• The pH and conductance of a weak acid (HX) was found to be 5 and 4× 10⁻⁵ S…
• Following figure shows dependence of molar conductance of two electrolytes on…

Kohlrausch's Law

• Consider the following data. Electrolyte, ∧ₘ°(S cm² mol¹); BaCl₂, x₁; H₂SO₄, x₂; HCl, x₃…
• Given below is the plot of the molar conductivity vs √concentration for KCl in aqueous…
• Correct order of limiting molar conductivity for cations in water at 298 K is :
• The equation that is incorrect is :
• Which out of the following is a correct equation to show change in molar conductivity…
• The molar conductance of an infinitely dilute solution of ammonium chloride was found to…
• The molar conductivities at infinite dilution of barium chloride, sulphuric acid and…
• For strong electrolyte Λₘ increases slowly with dilution and can be represented by the…
• The molar conductivity for electrolytes A and B are plotted against C^(3 / 2) as shown…
• Molar conductivity of a weak acid HQ of concentration 0.18 M was found to be 1/30 of the…
• The limiting molar conductivities of NaI, NaNO₃ and AgNO₃ are 12.7, 12.0 and 13.3 mS m²…
• The conductivity of a weak acid HA of concentration 0.001 mol L⁻¹ is 2.0 × 10⁻⁵ S cm⁻¹…
• Molar ionic conductivities of divalent cation and anion are 57 S cm² mol⁻¹ and 73 S cm²…

Batteries and Fuel Cells

• On charging the lead storage battery, the oxidation state of lead changes from x₁ to y₁…
• Match List I with List II LIST I (Cell) | LIST II (Use/Property/Reaction); A. |…
• The metals that are employed in the battery industries are A. Fe B. Mn C. Ni D. Cr E. Cd…
• Consider the following two half-cell reactions along with the standard reduction…
• Fuel cell, using hydrogen and oxygen as fuels, A. has been used in spaceship B. has as…
• Match List - I with List - II. List - I | List - II; (A) | Cd(s) + 2Ni(OH)₃(s) → CdO(s)…
• Match List - I with List - II : List - I (Applications) | List - II (Batteries/Cell)…
• The standard cell potential (E_(cell)⊖) of a fuel cell based on the oxidation of…
• For lead storage battery pick the correct statements A. During charging of battery…
• The reaction at cathode in the cells commonly used in clocks involves.

More Chemistry chapters

• Mole Concept & Stoichiometry
• Atomic Structure
• Gaseous State
• Chemical Thermodynamics
• Chemical Equilibrium
• Ionic Equilibrium
• Redox Reactions
• Solutions & Colligative Properties
• Chemical Kinetics
• Solid State
• Surface Chemistry
• Nuclear & Radiochemistry
• Periodic Table & Periodicity
• Chemical Bonding & Molecular Structure
• Hydrogen & s-Block Elements
• p-Block Elements — Part I (Group 13 & 14)
• Environmental Chemistry
• p-Block Elements — Part II (Group 15-18)
• d & f Block Elements
• Coordination Compounds
• Metallurgy
• Qualitative Analysis — Salt Analysis
• Purification & Characterisation of Organic Compounds
• General Organic Chemistry (GOC)
• Hydrocarbons — Alkanes
• Hydrocarbons — Alkenes & Alkynes
• Hydrocarbons — Aromatic (Arenes)
• Halogen Derivatives — Haloalkanes & Haloarenes
• Alcohols, Phenols & Ethers
• Aldehydes & Ketones
• Carboxylic Acids & Their Derivatives
• Amines & Diazonium Salts
• Carbohydrates & Biomolecules
• Polymers
• Chemistry in Everyday Life
• Practical Organic Chemistry

Frequently asked questions

How many Electrochemistry questions are there for JEE Main?

PrepWiser has 165 Electrochemistry questions for JEE Main, grouped into 8 topics such as Electrochemical Cells, Nernst Equation and Corrosion.

Are these Electrochemistry questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Electrochemistry questions?

Open any Electrochemistry question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.