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Friday, 9 October

JEE Main 2026 · ChemistryNumerical answerNumerical valueHardMulti-step

JEE Main 2 April 2026, Shift 2, Chemistry Q73

Question 73 of 75 in this shift, Chemistry question 23 of 25, Section B.

Consider the following two half-cell reactions along with the standard reduction potential given: CO2+6H++6e−⟶CH3OH+H2OCO_2 + 6H^+ + 6e^- \longrightarrow CH_3OH + H_2O Eredo=0.02E^o_{red} = 0.02 V 12O2+2H++2e−⟶H2O\frac{1}{2}O_2 + 2H^+ + 2e^- \longrightarrow H_2O Eredo=1.23E^o_{red} = 1.23 V A fuel cell was set up using the above two reactions such that the cell operates under the standard condition of 1 bar pressure and 298 K temperature. The fuel cell works with 80% efficiency. If the work derived from the cell using 1 mol of CH3OHCH_3OH is used to compress an ideal gas isothermally against a constant pressure of 1 kPa, then the change in the volume of the gas, ΔV=\Delta V = __________ m3^3. (nearest integer) Given: F=96500F = 96500 C mol−1^{-1}

Official answer

560

NTA final key.

Chapter
Electrochemistry
Topic
Gibbs Free Energy
Idea tested
Gibbs Energy and Cell Potential

Same topic in other shifts

All Gibbs Free Energy questions
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  2. 4 Apr 2026, Shift 2 · Q72For the following reaction at 50 ∘^\circC and at 2 atm pressure, 2N2O5(g)⇌2N2O4(g)+O2(g)\mathrm{2N_2O_5(g)\rightleftharpoons2N_2O_4(g)+O_2(g)}…HardNumerical value
  3. 5 Apr 2026, Shift 2 · Q54Consider the following data for the reaction X2(g)+Y2(g)⇌2XY(g)\mathrm{X_2(g)+Y_2(g)\rightleftharpoons 2XY(g)} at 600 K. The ΔrG⊖\Delta_r G^\ominus (in kJ…MediumSingle correct
  4. 6 Apr 2026, Shift 1 · Q75Consider the reaction X⇌Y\mathrm{X\rightleftharpoons Y} at 300 K. If ΔHθ\Delta H^\theta and K are 28.40 kJ mol−1^{-1} and 1.8×10−71.8\times10^{-7}…MediumNumerical value
  5. 2 Apr 2025, Shift 2 · Q54Which of the following graphs correctly represents the variation of thermodynamic properties of Haber's process ?HardDiagram basedHas a figure
  6. 3 Apr 2025, Shift 1 · Q53Which of the following properties will change when system containing solution 1 will become solution 2? Solution 1: 10 mol of solute x +…MediumDiagram basedHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.