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Friday, 16 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 topic in other shifts

All Chemical Equilibrium questions
  1. 4 Apr 2026, Shift 1 · Q55At T(K), the equilibrium constant of A2(g)+B2(g)⇌C(g)\mathrm{A_2}(g)+\mathrm{B_2}(g)\rightleftharpoons \mathrm{C}(g) is 2.7×10−52.7\times10^{-5}. What is the…EasySingle correct
  2. 5 Apr 2026, Shift 1 · Q74The values of pressure equilibrium constant recorded at different temperatures for the following equilibrium reaction have been given…MediumNumerical value
  3. 5 Apr 2026, Shift 2 · Q56The reaction A(g)⇌B(g)+C(g)\mathrm{A(g)\rightleftharpoons B(g)+C(g)} was initiated with the amount 'a' of A(g). At equilibrium it is found that the…MediumSingle correct
  4. 6 Apr 2026, Shift 1 · Q57One mole each of He and A(g) are taken in a 10 L closed flask and heated to 400 K to establish the following equilibrium.…MediumSingle correct
  5. 8 Apr 2026, Shift 2 · Q55Consider the following reactions in which all the reactants and products are present in gaseous state 2 xy⇌x2+y22\,xy \rightleftharpoons x_2 + y_2…MediumSingle correct
  6. 8 Apr 2026, Shift 2 · Q75Solid carbon, CaO and CaCO3\mathrm{CaCO_3} are mixed and allowed to attain equilibrium at T K.…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.