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Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctMediumCalculation

JEE Main 5 April 2026, Shift 2, Chemistry Q57

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

One half cell in a voltaic cell is constructed by dipping silver rod in AgNO3\mathrm{AgNO_3} solution of unknown concentration, other half cell is Zn rod dipped in 1 molar solution of ZnSO4\mathrm{ZnSO_4}. A voltage of 1.60 V is measured at 298 K for this cell. What is the concentration of Ag+\mathrm{Ag^+} ions used in terms of log⁡x\log x (x=[Ag+]x=[\mathrm{Ag^+}]) ? EZn2+/Zn∘=−0.76 VE^\circ_{\mathrm{Zn^{2+}/Zn}}=-0.76\,\mathrm{V}, EAg+/Ag∘=+0.80 VE^\circ_{\mathrm{Ag^+/Ag}}=+0.80\,\mathrm{V}, 2.303RTF=0.059 V\frac{2.303RT}{F}=0.059\,\mathrm{V}
  1. (1)23.9\frac{2}{3.9}
  2. (2)45.9\frac{4}{5.9}Official answer
  3. (3)2.92\frac{2.9}{2}
  4. (4)5.94\frac{5.9}{4}

Official answer

Option 2

NTA final key.

Chapter
Electrochemistry
Topic
Nernst Equation
Idea tested
Full Cell Nernst Equation

Same idea in other shifts

Asked 6× in all
  1. 4 Apr 2026, Shift 2 · Q73An electrochemical cell, consist of the following two redox couples, Mx+(aq)/M(s)\mathrm{M^{x+}(aq)/M(s)} [Ered⊖=+0.15 V][E^\ominus_{red}=+0.15\ \mathrm{V}] and…HardNumerical value
  2. 7 Apr 2025, Shift 1 · Q711 Faraday electricity was passed through Cu2+\mathrm{Cu^{2+}} (1.5 M, 1 L) /Cu and 0.1 Faraday was passed through Ag+\mathrm{Ag^+} (0.2 M, 1…HardNumerical valueHas a figure
  3. 25 Jul 2022, Shift 1 · Q84The cell potential for Zn∣Zn2+(aq)∥Snx+∣ Sn\mathrm{Zn|Zn^{2+}(aq)\|Sn^{x+}|\,Sn} is 0.8010.801 V at 298 K. The reaction quotient for the above reaction is…MediumNumerical value
  4. 24 Jun 2022, Shift 1 · Q84The cell potential for the following cell Pt ∣H2(g)∣H+(aq)∥ Cu2+(0.01 M)∣Cu(s)\mathrm{Pt\,|H_2(g)|H^+(aq)\|\ Cu^{2+}(0.01\ M)|Cu(s)} is 0.576 V at 298 K. The pH of the…MediumNumerical value
  5. 25 Jul 2021, Shift 1 · Q58Consider the cell at 25∘^\circC Zn∣Zn2+(aq),(1 M) ∣∣ Fe3+(aq),Fe2+(aq)∣Pt(s)\mathrm{Zn|Zn^{2+}(aq),(1\ M)\,||\,Fe^{3+}(aq),Fe^{2+}(aq)|Pt(s)} The fraction of total iron present as…HardNumerical value

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.