21 JEE Main 2026 Electrochemistry previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2026 previous-year questions from the Electrochemistry chapter of Chemistry. Each links to a full solution with a verified answer key. To see the whole chapter across all years, visit the Electrochemistry chapter hub.
An electrochemical cell, consist of the following two redox couples, Mx⁺(aq)/M(s) [Ered^=+0.15 V] and Fe³⁺(aq)/Fe(s) [E…
Consider the above electrochemical cell where a metal electrode (M) is undergoing redox reaction by forming M⁺ (M → M⁺+…
For strong electrolyte increases slowly with dilution and can be represented by the equation =ⁱrc-Ac¹ / ² Molar conduct…
In the given electrochemical cell, Ag(s)|AgCl(s)| FeCl₂(aq), FeCl₃(aq) Pt(s) at 298 K, the cell potential (Ecell ) will…
Consider the following reduction processes : Al³⁺+3 e⁻ Al(s), E⁰=-1.66 ~V Fe³⁺+e⁻ Fe²⁺, E⁰=+0.77 ~V Co³⁺+e⁻ Co²⁺, E⁰=+1…
Consider the following electrochemical cell at 298 K Pt |HSnO₂ ⁻(aq) | Sn(OH)₆ ²⁻(aq) |OH⁻(aq) | Bi₂ O₃(~s) Bi(s). If t…
At 298 K, the molar conductivity of x\% (w/w) MX solution (aqueous) is 123.5 S cm² mol⁻¹. The conductance of same solut…
Consider the following data. Electrolyte Λⁱrcm (S cm² mol⁻¹) BaCl₂ x₁ H₂SO₄ x₂ HCl x₃ BaSO₄ is sparingly soluble in wat…
Consider the following electrochemical cell : Pt |O₂(~g)(1 bar) | HCl(aq) \| M²⁺(aq, 1.0 M) M(~s) The pH above which, o…
Given at 298 K: EⁱⁿusFe²⁺/Fe = X Volt; EⁱⁿusFe³⁺/Fe = Y Volt. The EⁱⁿusFe³⁺/Fe²⁺ in Volt at 298 K is given by:
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