JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 25 July 2022, Shift 1, Chemistry Q84

Question 84 of 90 in this shift, Chemistry question 24 of 30, Section B.

The cell potential for

\mathrm{Zn|Zn^{2+}(aq)\|Sn^{x+}|\,Sn}

0.801

V at 298 K. The reaction quotient for the above reaction is

10^{-2}

. The number of electrons involved in the given electrochemical cell reaction is ______. (Given :

E^{\mathrm{o}}_{\mathrm{Zn^{2+}|Zn}}=-0.763

E^{\mathrm{o}}_{\mathrm{Sn^{x+}|Sn}}=+0.008

V and

\frac{2.303RT}{F}=0.06

Official answer

NTA final key (2022 Session 2).

Chapter: Electrochemistry
Topic: Nernst Equation
Idea tested: Full Cell Nernst Equation

Same idea in other shifts

Asked 6× in all

4 Apr 2026, Shift 2 · Q73An electrochemical cell, consist of the following two redox couples, $\mathrm{M^{x+}(aq)/M(s)}$ $[E^\ominus_{red}=+0.15\ \mathrm{V}]$ and…HardNumerical value
5 Apr 2026, Shift 2 · Q57One half cell in a voltaic cell is constructed by dipping silver rod in $\mathrm{AgNO_3}$ solution of unknown concentration, other half…MediumSingle correct
7 Apr 2025, Shift 1 · Q711 Faraday electricity was passed through $\mathrm{Cu^{2+}}$ (1.5 M, 1 L) /Cu and 0.1 Faraday was passed through $\mathrm{Ag^+}$ (0.2 M, 1…HardNumerical valueHas a figure
24 Jun 2022, Shift 1 · Q84The cell potential for the following cell $\mathrm{Pt\,|H_2(g)|H^+(aq)\|\ Cu^{2+}(0.01\ M)|Cu(s)}$ is 0.576 V at 298 K. The pH of the…MediumNumerical value
25 Jul 2021, Shift 1 · Q58Consider the cell at 25 $^\circ$ C $\mathrm{Zn|Zn^{2+}(aq),(1\ M)\,||\,Fe^{3+}(aq),Fe^{2+}(aq)|Pt(s)}$ 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.