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Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 2 April 2026, Shift 1, Chemistry Q57

Question 57 of 75 in this shift, Chemistry question 7 of 25, Section A.

An electrochemical cell is constructed using half cells in the direction of spontaneous change Fe(OH)2(s)+2e−→Fe(s)+2OH−(aq)\mathrm{Fe(OH)_2(s)+2e^-\rightarrow Fe(s)+2OH^-(aq)} Eθ=−0.88E^\theta=-0.88 V and AgBr(s)+e−→Ag(s)+Br−(aq)\mathrm{AgBr(s)+e^-\rightarrow Ag(s)+Br^-(aq)} Eθ=+0.07E^\theta=+0.07 V Which of the following option is correct ?
  1. (1)Overall reaction Fe(s)+2OH−(aq)+2AgBr(s)⇌Fe(OH)2(s)+2Ag(s)+2Br−(aq)\mathrm{Fe(s)+2OH^-(aq)+2AgBr(s)\rightleftharpoons Fe(OH)_2(s)+2Ag(s)+2Br^-(aq)}Official answer
  2. (2)Ecellθ=−0.95E^\theta_{cell}=-0.95 V
  3. (3)Fe is reduced in the electrochemical cell
  4. (4)EcellθE^\theta_{cell} is an extensive property

Official answer

Option 1

NTA final key.

Chapter
Electrochemistry
Topic
Nernst Equation
Idea tested
Standard Cell Potential

Same idea in other shifts

Asked 6× in all
  1. 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
  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.