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Saturday, 31 October

JEE Main 2025 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 2 April 2025, Shift 1, Chemistry Q73

Question 73 of 75 in this shift, Chemistry question 23 of 25, Section B.

Consider the following equilibrium, CO(g)+2H2(g)⇌CH3OH(g)\mathrm{CO(g)+2H_2(g)\rightleftharpoons CH_3OH(g)} 0.1 mol of CO along with a catalyst is present in a 2 dm3\mathrm{dm^3} flask maintained at 500 K. Hydrogen is introduced into the flask until the pressure is 5 bar and 0.04 mol of CH3OH\mathrm{CH_3OH} is formed. The KpθK_p^\theta is ___________ ×10−3\times10^{-3} (nearest integer). Given : R=0.08 dm3 bar K−1 mol−1R=0.08\ \mathrm{dm^3\ bar\ K^{-1}\ mol^{-1}} Assume only methanol is formed as the product and the system follows ideal gas behaviour.

Official answer

74

NTA final key.

Chapter
Equilibrium
Topic
Chemical Equilibrium
Idea tested
Dalton's Law in Kp Calculations

Same idea in other shifts

Asked 3× in all
  1. 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
  2. 10 Apr 2023, Shift 2 · Q85A(g)⇌2B(g)+C(g)\mathrm{A}(g) \rightleftharpoons 2\mathrm{B}(g) + \mathrm{C}(g) For the given reaction, if the initial pressure is 450 mm Hg and the…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.