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Saturday, 31 October

JEE Main 2026 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 6 April 2026, Shift 2, Chemistry Q74

Question 74 of 75 in this shift, Chemistry question 24 of 25, Section B.

In a closed flask at 600 K, one mole of X2Y4(g)\mathrm{X_2Y_4(g)} attains equilibrium as given below : X2Y4(g)⇌2XY2(g)\mathrm{X_2Y_4(g)\rightleftharpoons 2XY_2(g)} At equilibrium, 75% X2Y4(g)\mathrm{X_2Y_4(g)} was dissociated and the total pressure is 1 atm. The magnitude of ΔrG⊖\Delta_rG^\ominus (in kJ mol−1^{-1}) at this temperature is __________. (Nearest Integer) (Given : R = 8.3 J mol−1^{-1} K−1^{-1}; ln 10 = 2.3, log 2 = 0.3, log 3 = 0.48, log 5 = 0.69, log 7 = 0.84)

Official answer

8

NTA final key.

Chapter
Equilibrium
Topic
Chemical Equilibrium
Idea tested
Standard Gibbs Free Energy and Equilibrium Constant

Same idea in other shifts

Asked 3× in all
  1. 25 Jun 2022, Shift 1 · Q86The standard free energy change (ΔG∘\Delta \mathrm{G^\circ}) for 50% dissociation of N2O4\mathrm{N_2O_4} into NO2\mathrm{NO_2} at 27°C and 1…MediumNumerical value
  2. 18 Mar 2021, Shift 2 · Q53The gas phase reaction 2A(g)⇌A2(g)\mathrm{2A(g) \rightleftharpoons A_2(g)} at 400 K has ΔG∘=+25.2\Delta G^\circ = +25.2 kJ mol−1^{-1}. The equilibrium…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.