In which one of the following equilibria, K p = K C ?

NO 2 (g) + SO 2 (g) ⇋ NO(g) + SO 3 (g)

In which of the following reactions, an increase in the volume of the container will favour the formation of products?

2NO 2 (g) $$\rightleftharpoons$$ 2NO(g) + O 2 (g)

H 2 (g) + I 2 (g) $$\rightleftharpoons$$ 2HI(g)

4NH 3 (g) + 5O 2 (g) $$\rightleftharpoons$$ 4NO(g) + 6H 2 O(1)

3O 2 (g) $$\rightleftharpoons$$ 2O 3 (g)

Chemical Equilibrium — JEE Main Previous Year Questions

103 solved PYQs · 2016–2026 · Chemistry

Solved PYQs: 103
Years covered: 2016–2026
Avg / year: ~9
Subject: Chemistry

How many JEE Main questions come from Chemical Equilibrium?

Chemical Equilibrium has contributed 103 questions to Joint Entrance Examination (Main) papers between 2016 and 2026 — an average of about 9 questions a year. That count is measured from EByAi’s bank of 55,289 JEE Main questions, not estimated from a syllabus. Every one of the 103 questions carries a written, step-by-step solution, and each is tagged to Chemical Equilibrium within Chemistry, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample Chemical Equilibrium questions from real JEE Main papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 103 Chemical Equilibrium questions (with full written solutions) are available in practice.

Question 1 · JEE Main 2026
Observe the following equilibrium in a 1 L flask. A(g) ⇌ B(g) At T(K), the equilibrium concentrations of A and B are 0.5 M and 0.375 M respectively. 0.1 moles of A are added into the flask and heated to T(K) to establish the equilibrium again. The new equilibrium concentrations (in M) of A and B are respectively
1. (A) $0.742, 0.557.$
2. (B) $0.367, 0.275.$
3. (C) $0.53, 0.4.$
4. (D) $0.557, 0.418.$
Show answerAnswer
$Answer: (D) 0.557, 0.418.$
Question 2 · JEE Main 2020
An open beaker of water in equilibrium with water vapour is in a sealed container. When a few grams of glucose are added to the beaker of water, the rate at which water molecules:
1. (A) $leaves the solution increases$
2. (B) $leaves the vapour increases$
3. (C) $leaves the vapour decreases$
4. (D) $leaves the solution decreases$
Show answerAnswer
$Answer: (D) leaves the solution decreases$
Question 3 · JEE Main 2019
In which one of the following equilibria, K p = K C ?
1. (A) $2NO(g) ⇋ N 2 (g) + O 2 (g)$
2. (B) $2C(s) + O 2 (g) ⇋ 2CO(g)$
3. (C) $2HI(g) ⇋ H 2 (g) + I 2 (g)$
4. (D) $NO 2 (g) + SO 2 (g) ⇋ NO(g) + SO 3 (g)$
Show answerAnswer
$Answer: (B) 2C(s) + O 2 (g) ⇋ 2CO(g)$
Question 4 · JEE Main 2019
For the following reactions, equilibrium constants are given : S(s) + O_2 (g) ⇋ SO_2 (g); K 1 = 10 52 2S(s) + 3O 2 (g) ⇋ 2SO 3 (g); K 2 = 10 129 The equilibrium constant for the reaction, 2SO_2 (g) + O_2 (g) ⇋ 2SO_3 (g) is :
1. (A) $10 181$
2. (B) $10 25$
3. (C) $10 77$
4. (D) $10 154$
Show answerAnswer
$Answer: (B) 10 25$
Question 5 · JEE Main 2018
In which of the following reactions, an increase in the volume of the container will favour the formation of products?
1. (A) $2NO 2 (g) ⇌ 2NO(g) + O 2 (g)$
2. (B) $H 2 (g) + I 2 (g) ⇌ 2HI(g)$
3. (C) $4NH 3 (g) + 5O 2 (g) ⇌ 4NO(g) + 6H 2 O(1)$
4. (D) $3O 2 (g) ⇌ 2O 3 (g)$
Show answerAnswer
$Answer: (A) 2NO 2 (g) ⇌ 2NO(g) + O 2 (g)$

Chemical Equilibrium questions by year

Year	Questions	Share of chapter questions
2026	14
2025	11
2024	10
2023	13
2022	11
2021	19
2020	9
2019	10
2018	3
2017	1
2016	2

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FAQs

How many JEE Main questions have been asked from Chemical Equilibrium?

EByAi's bank holds 103 real JEE Main questions from Chemical Equilibrium, asked between 2016 and 2026 — about 9 per year on average. Every count is measured from actual papers, not estimated.

Is Chemical Equilibrium important for JEE Main?

103 questions over 11 papers make Chemical Equilibrium a moderate-weightage chapter in JEE Main Chemistry. The year-wise table above shows exactly how often it appears.

Can I solve Chemical Equilibrium PYQs online for free?

Yes. EByAi lets you solve JEE Main past-year questions in the browser with written solutions — free daily practice, no card needed.

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