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Saturday, 31 October

JEE Main 2023 · ChemistryNumerical answerNumerical valueMediumConceptual

JEE Main 8 April 2023, Shift 2, Chemistry Q86

Question 86 of 90 in this shift, Chemistry question 26 of 30, Section B.

The number of incorrect statements from the following is ____________ A. The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction Gibbs energy. B. Ecell∘E^{\circ}_{cell} is dependent on the pressure. C. dEcellθdT=ΔrSθnF\frac{dE^{\theta}_{cell}}{dT} = \frac{\Delta_r S^{\theta}}{nF} D. A cell is operating reversibly if the cell potential is exactly balanced by an opposing source of potential difference.

Official answer

1

NTA final key.

Chapter
Electrochemistry
Topic
Nernst Equation
Idea tested
Gibbs Energy and EMF

Same idea in other shifts

Asked 4× in all
  1. 27 Jun 2022, Shift 2 · Q87For the reaction taking place in the cell: Pt(s)∣H2(g)∣H+(aq) ∣∣ Ag+(aq)∣Ag(s)\mathrm{Pt(s)|H_2(g)|H^{+}(aq)\,||\,Ag^{+}(aq)|Ag(s)} Ecell∘\mathrm{E^\circ_{cell}} = + 0.5332 V.…MediumNumerical value
  2. 2 Sep 2020, Shift 1 · Q47The Gibbs energy change (in J) for the given reaction at [Cu2+]=[Sn2+]=1[\mathrm{Cu^{2+}}]=[\mathrm{Sn^{2+}}]=1 M and 298 K is :…EasyNumerical value
  3. 5 Sep 2020, Shift 1 · Q49An oxidation-reduction reaction in which 3 electrons are transferred has a ΔG0\Delta \mathrm{G}^{0} of 17.37 kJ mol−1^{-1} at…EasyNumerical 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.