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Friday, 9 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 3 April 2025, Shift 2, Chemistry Q56

Question 56 of 75 in this shift, Chemistry question 6 of 25, Section A.

The 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 power television relay station is measured as 1.21 V. The standard half cell reduction potential for O2\mathrm{O_2} (EO2/H2O∘\mathrm{E^\circ_{O_2/H_2O}}) is 1.229 V. Choose the correct statement:
  1. (1)Oxygen is formed at the anode.
  2. (2)Reduction of methanol takes place at the cathode.
  3. (3)The standard half cell reduction potential for the reduction of CO2\mathrm{CO_2} (ECO2/CH3OH∘\mathrm{E^\circ_{CO_2/CH_3OH}}) is 19 mVOfficial answer
  4. (4)Reactants are fed at one go to each electrode.

Official answer

Option 3

NTA final key.

Chapter
Electrochemistry
Topic
Nernst Equation
Idea tested
Standard Cell Potential

Same idea in other shifts

Asked 6× in all
  1. 2 Apr 2026, Shift 1 · Q57An electrochemical cell is constructed using half cells in the direction of spontaneous change…MediumSingle correct
  2. 9 Apr 2024, Shift 1 · Q85The standard reduction potentials at 298 K for the following half cells are given below :…MediumNumerical value
  3. 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
  4. 28 Jul 2022, Shift 1 · Q70Which of the following has least tendency to liberate H2\mathrm{H_2} from mineral acids ?EasySingle correct
  5. 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

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.