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Saturday, 10 October

JEE Main 2026 · ChemistryMultiple choiceSingle correctMediumCalculation

JEE Main 8 April 2026, Shift 2, Chemistry Q55

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

Consider 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 K1=2.5×105\quad \mathrm{K_1} = 2.5 \times 10^{5} xy+12z2⇌xyzxy + \frac{1}{2}z_2 \rightleftharpoons xyz K2=5×10−3\quad \mathrm{K_2} = 5 \times 10^{-3} The value of K3\mathrm{K_3} for the equilibrium 12x2+12y2+12z2⇌xyz\frac{1}{2}x_2 + \frac{1}{2}y_2 + \frac{1}{2}z_2 \rightleftharpoons xyz is :
  1. (1)2.5×10−32.5 \times 10^{-3}
  2. (2)2.5×1032.5 \times 10^{3}
  3. (3)1.0×10−51.0 \times 10^{-5}Official answer
  4. (4)5×10−35 \times 10^{-3}

Official answer

Option 3

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. 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. 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.