JEE Main 2023 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 11 April 2023, Shift 1, Chemistry Q85

Question 85 of 90 in this shift, Chemistry question 25 of 30, Section B.

A mixture of 1 mole of

\mathrm{H_2O}

and 1 mole of CO is taken in a 10 litre container and heated to 725 K. At equilibrium 40% of water by mass reacts with carbon monoxide according to the equation:

\mathrm{CO(g) + H_2O(g) \rightleftharpoons CO_2(g) + H_2(g)}

. The equilibrium constant

\mathrm{K_c} \times 10^2

for the reaction is ____________. (Nearest integer)

Official answer

NTA final key.

Chapter: Equilibrium
Topic: Chemical Equilibrium
Idea tested: Degree of Dissociation

Same idea in other shifts

Asked 4× in all

8 Apr 2025, Shift 2 · Q74The equilibrium constant for decomposition of $\mathrm{H_2O}$ (g) $\mathrm{H_2O(g) \rightleftharpoons H_2(g) + \frac{1}{2}O_2(g)}$ …MediumNumerical value
6 Apr 2023, Shift 1 · Q62For a concentrated solution of a weak electrolyte ( $K_{eq}$ = equilibrium constant) $\mathrm{A_2B_3}$ of concentration 'c', the degree of…MediumSingle correct
24 Jun 2022, Shift 1 · Q64For a reaction at equilibrium $\mathrm{A(g)} \rightleftharpoons \mathrm{B(g)}+\frac{1}{2}\mathrm{C(g)}$ the relation between dissociation…MediumSingle 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.