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Friday, 9 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 4 April 2026, Shift 1, Chemistry Q55

Question 55 of 75 in this shift, Chemistry question 5 of 25, Section A.

At 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 equilibrium constant for 13A2(g)+13B2(g)⇌13C(g)\frac13\mathrm{A_2}(g)+\frac13\mathrm{B_2}(g)\rightleftharpoons\frac13\mathrm{C}(g) at the same temperature?
  1. (1)(2.7×10−5)3(2.7\times10^{-5})^3
  2. (2)6×10−26\times10^{-2}
  3. (3)2.7×10−5\sqrt{2.7\times10^{-5}}
  4. (4)3×10−23\times10^{-2}Official answer

Official answer

Option 4

NTA final key.

Chapter
Equilibrium
Topic
Chemical Equilibrium
Idea tested
Equilibrium Constant for Modified Equations

Same idea in other shifts

Asked 4× in all
  1. 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
  2. 8 Apr 2024, Shift 1 · Q63For the given hypothetical reactions, the equilibrium constants are as follows : X⇌Y\mathrm{X\rightleftharpoons Y}; K1=1.0K_1=1.0…EasySingle correct
  3. 6 Sep 2020, Shift 2 · Q44The value of Kc\mathrm{K_c} is 64 at 800 K for the reaction N2(g)+3H2(g)⇌2NH3(g)\mathrm{N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)} The value of…EasySingle correct

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.