The equilibrium constant for the reaction $\mathrm{SO_3(g) \rightleftharpoons SO_2(g) + \frac{1}{2}O_2(g)}$ is $\mathrm{K_c} = 4.9 \times 10^{-2}$. The value of $\mathrm{K_c}$ for the reaction given below is $\mathrm{2\,SO_2(g) + O_2(g) \rightleftharpoons 2\,SO_3(g)}$ :

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 4 April 2024, Shift 2, Chemistry Q63

Question 63 of 90 in this shift, Chemistry question 3 of 30, Section A.

The equilibrium constant for the reaction

\mathrm{SO_3(g) \rightleftharpoons SO_2(g) + \frac{1}{2}O_2(g)}

\mathrm{K_c} = 4.9 \times 10^{-2}

. The value of

\mathrm{K_c}

for the reaction given below is

\mathrm{2\,SO_2(g) + O_2(g) \rightleftharpoons 2\,SO_3(g)}

(1)4.9
(2)416Official answer
(3)41.6
(4)49

Official answer

Option 2

NTA final key.

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

Same idea in other shifts

Asked 9× in all

4 Apr 2026, Shift 1 · Q55At T(K), the equilibrium constant of $\mathrm{A_2}(g)+\mathrm{B_2}(g)\rightleftharpoons \mathrm{C}(g)$ is $2.7\times10^{-5}$ . What is the…EasySingle correct
8 Apr 2026, Shift 2 · Q55Consider the following reactions in which all the reactants and products are present in gaseous state $2\,xy \rightleftharpoons x_2 + y_2$ …MediumSingle correct
8 Apr 2024, Shift 1 · Q63For the given hypothetical reactions, the equilibrium constants are as follows : $\mathrm{X\rightleftharpoons Y}$ ; $K_1=1.0$ …EasySingle correct
25 Jul 2022, Shift 2 · Q63 $\mathrm{K_{a_1}}$ , $\mathrm{K_{a_2}}$ and $\mathrm{K_{a_3}}$ are the respective ionization constants for the following reactions (a),…MediumSingle correct
26 Jul 2022, Shift 1 · Q86At 298 K, the equilibrium constant is $2 \times 10^{15}$ for the reaction :…MediumNumerical value
30 Jun 2022, Shift 1 · Q64The equilibrium constant for the reversible reaction $2\mathrm{A(g)} \rightleftharpoons 2\mathrm{B(g)}+\mathrm{C(g)}$ is $\mathrm{K_1}$ …EasySingle correct
4 Sep 2020, Shift 2 · Q28If the equilibrium constant for $\mathrm{A \rightleftharpoons B + C}$ is $K_{eq}^{(1)}$ and that of $\mathrm{B + C \rightleftharpoons P}$ …EasySingle correct
6 Sep 2020, Shift 2 · Q44The value of $\mathrm{K_c}$ is 64 at 800 K for the reaction $\mathrm{N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)}$ 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 108 of the 174 JEE Main shifts held from 2017 to 2026.