JEE Main 2023 · ChemistryMultiple choiceSingle correctMediumCalculation

JEE Main 6 April 2023, Shift 1, Chemistry Q62

Question 62 of 90 in this shift, Chemistry question 2 of 30, Section A.

For a concentrated solution of a weak electrolyte (

K_{eq}

= equilibrium constant)

\mathrm{A_2B_3}

of concentration 'c', the degree of dissociation '

\alpha

' is

(1) $\left(\frac{K_{eq}}{6c^5}\right)^{\frac15}$
(2) $\left(\frac{K_{eq}}{108c^4}\right)^{\frac15}$ Official answer
(3) $\left(\frac{K_{eq}}{5c^4}\right)^{\frac15}$
(4) $\left(\frac{K_{eq}}{25c^2}\right)^{\frac15}$

Official answer

Option 2

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
11 Apr 2023, Shift 1 · Q85A 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…MediumNumerical value
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.