JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 22 July 2021, Shift 2, Chemistry Q56

Question 56 of 90 in this shift, Chemistry question 26 of 30, Section B.

Assume a cell with the following reaction

\mathrm{Cu_{(s)} + 2Ag^+ (1\times10^{-3}\ M) \rightarrow Cu^{2+} (0.250\ M) + 2\ Ag_{(s)}}

\mathrm{E^{\ominus}_{cell}}

= 2.97 V

\mathrm{E_{cell}}

for the above reaction is ________ V. (Nearest integer) [Given : log 2.5=0.3979, T=298 K]

Official answer

NTA final key.

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

Same idea in other shifts

Asked 12× 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
8 Apr 2024, Shift 2 · Q63The emf of cell $\mathrm{Tl\,|\,Tl^+(0.001\,M)\,||\,Cu^{2+}(0.01\,M)\,|\,Cu}$ is 0.83 V at 298 K. It could be increased by :MediumSingle correct
25 Jul 2022, Shift 1 · Q84The cell potential for $\mathrm{Zn|Zn^{2+}(aq)\|Sn^{x+}|\,Sn}$ is $0.801$ V at 298 K. The reaction quotient for the above reaction is…MediumNumerical value
29 Jul 2022, Shift 2 · Q84For a cell, $\mathrm{Cu(s) \mid Cu^{2+}(0.001M) \mid\mid Ag^{+}(0.01M) \mid Ag(s)}$ the cell potential is found to be 0.43 V at 298 K. The…MediumNumerical value
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
26 Aug 2021, Shift 2 · Q56For the galvanic cell, $\mathrm{Zn(s) + Cu^{2+}}$ (0.02 M) $\rightarrow \mathrm{Zn^{2+}}$ (0.04 M) $+ \mathrm{Cu(s)}$ , $\mathrm{E_{cell}}$ …MediumNumerical 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 108 of the 174 JEE Main shifts held from 2017 to 2026.