JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 6 September 2020, Shift 2, Chemistry Q44

Question 44 of 75 in this shift, Chemistry question 19 of 25.

The 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

\mathrm{K_c}

for the following reaction is :

\mathrm{NH_3(g)\rightleftharpoons \frac{1}{2}N_2(g)+\frac{3}{2}H_2(g)}

(1)1/64
(2)8
(3)1/8Official answer
(4)1/4

Official answer

Option 3

NTA final key (Sep 2020).

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

Same idea in other shifts

Asked 4× 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

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.