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Friday, 9 October

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 ; Cu(s)∣Cu2+(C1 M)∣∣Cu2+(C2 M)∣Cu(s)\mathrm{Cu(s)|Cu^{2+}(C_1\ M)||Cu^{2+}(C_2\ M)|Cu(s)} change in Gibbs energy (ΔG\Delta G) is negative, if :
  1. (1)C1=C2C_1=C_2
  2. (2)C2=C12C_2=\frac{C_1}{\sqrt{2}}
  3. (3)C2=2 C1C_2=\sqrt{2}\,C_1Official answer
  4. (4)C1=2C2C_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 2× in all
  1. 3 Aug 2021, Shift 2 · Q56The potential of a cell containing two hydrogen electrodes, one in contact with 10−810^{-8} M H+\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 42 of the 174 JEE Main shifts held from 2017 to 2026.