JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 6 September 2020, Shift 2, Chemistry Q45

Question 45 of 75 in this shift, Chemistry question 20 of 25.

For the given cell ;

\mathrm{Cu(s)|Cu^{2+}(C_1\ M)||Cu^{2+}(C_2\ M)|Cu(s)}

change in Gibbs energy (

\Delta G

) is negative, if :

(1) $C_1=C_2$
(2) $C_2=\frac{C_1}{\sqrt{2}}$
(3) $C_2=\sqrt{2}\,C_1$ Official answer
(4) $C_1=2C_2$

Official answer

Option 3

NTA final key (Sep 2020).

Chapter: Electrochemistry
Topic: Nernst Equation
Idea tested: Concentration Cells

Same idea in other shifts

Asked 3× in all

30 Jul 2022, Shift 2 · Q55For the given cell $\mathrm{Zn(s)} \mid \mathrm{Zn^{2+}}$ ( $\mathrm{C_1}$ , M) $\parallel$ $\mathrm{Zn}$ $^{2+}$ ( $\mathrm{C_2}$ M)…EasyNumerical value
3 Aug 2021, Shift 2 · Q56The potential of a cell containing two hydrogen electrodes, one in contact with $10^{-8}$ M $\mathrm{H^+}$ concentration and the other in…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.