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Friday, 9 October

JEE Main Chemistry · Equilibrium

Chemical Equilibrium in JEE Main

Chemical Equilibrium (Chemistry, Equilibrium) came 23 times in 21 of the 42 JEE Main shifts Lumi analysed, across 12 distinct ideas. 17 of them came in 2024–26; it was last asked in 2026.

Questions
23
in 21 shifts
Ideas asked
12
6 asked more than once
Numerical answer
8
35% of its questions
Pattern
Asked most years
last asked 2026
Questions each year
0480’172’201’211’222’235’245’257’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 9Medium 14Hard 0

Format

  • Single correct14 Q
  • Numerical value8 Q
  • Two statements1 Q
Ideas inside the topic
12 ideas
Where it sits

Part of Equilibrium, which had 52 questions in all. Chemical Equilibrium accounts for 44% of them. In Lumi's JEE taxonomy it belongs to Physical Chemistry.

Some questions sit in other chapters too: Thermodynamics (Chemistry).

Every question

All 23 Chemical Equilibrium questions

Newest first, each with its options and official answer.

  1. 4 Apr 2026, Shift 1 · Q55At T(K), the equilibrium constant of A2(g)+B2(g)⇌C(g)\mathrm{A_2}(g)+\mathrm{B_2}(g)\rightleftharpoons \mathrm{C}(g) is 2.7×10−52.7\times10^{-5}. What is the…EasySingle correct
  2. 5 Apr 2026, Shift 1 · Q74The values of pressure equilibrium constant recorded at different temperatures for the following equilibrium reaction have been given…MediumNumerical value
  3. 5 Apr 2026, Shift 2 · Q56The reaction A(g)⇌B(g)+C(g)\mathrm{A(g)\rightleftharpoons B(g)+C(g)} was initiated with the amount 'a' of A(g). At equilibrium it is found that the…MediumSingle correct
  4. 6 Apr 2026, Shift 1 · Q57One mole each of He and A(g) are taken in a 10 L closed flask and heated to 400 K to establish the following equilibrium.…MediumSingle correct
  5. 6 Apr 2026, Shift 2 · Q74In a closed flask at 600 K, one mole of X2Y4(g)\mathrm{X_2Y_4(g)} attains equilibrium as given below :…MediumNumerical value
  6. 8 Apr 2026, Shift 2 · Q55Consider the following reactions in which all the reactants and products are present in gaseous state 2 xy⇌x2+y22\,xy \rightleftharpoons x_2 + y_2…MediumSingle correct
  7. 8 Apr 2026, Shift 2 · Q75Solid carbon, CaO and CaCO3\mathrm{CaCO_3} are mixed and allowed to attain equilibrium at T K.…MediumNumerical value
  8. 2 Apr 2025, Shift 1 · Q73Consider the following equilibrium, CO(g)+2H2(g)⇌CH3OH(g)\mathrm{CO(g)+2H_2(g)\rightleftharpoons CH_3OH(g)} 0.1 mol of CO along with a catalyst is present in…MediumNumerical value
  9. 2 Apr 2025, Shift 2 · Q55Consider the following chemical equilibrium of the gas phase reaction at a constant temperature :…MediumSingle correct
  10. 3 Apr 2025, Shift 1 · Q55In the following system, PCl5(g)⇌PCl3(g)+Cl2(g)\mathrm{PCl_5(g)} \rightleftharpoons \mathrm{PCl_3(g)} + \mathrm{Cl_2(g)} at equilibrium, upon addition of…EasySingle correct
  11. 3 Apr 2025, Shift 1 · Q57Given below are two statements: Statement I : A catalyst cannot alter the equilibrium constant (Kc\mathrm{K_c}) of the reaction,…EasyTwo statements
  12. 8 Apr 2025, Shift 2 · Q74The equilibrium constant for decomposition of H2O\mathrm{H_2O} (g) H2O(g)⇌H2(g)+12O2(g)\mathrm{H_2O(g) \rightleftharpoons H_2(g) + \frac{1}{2}O_2(g)}…MediumNumerical value
  13. 6 Apr 2024, Shift 2 · Q63The ratio KPKC\frac{K_P}{K_C} for the reaction : CO(g)+12O2(g)⇌CO2(g)\mathrm{CO_{(g)}+\frac{1}{2}O_{2(g)}\rightleftharpoons CO_{2(g)}} is :EasySingle correct
  14. 8 Apr 2024, Shift 1 · Q63For the given hypothetical reactions, the equilibrium constants are as follows : X⇌Y\mathrm{X\rightleftharpoons Y}; K1=1.0K_1=1.0…EasySingle correct
  15. 29 Jan 2024, Shift 1 · Q85For the reaction N2O4(g)⇌2NO2(g)\mathrm{N_2O_{4(g)} \rightleftharpoons 2NO_{2(g)}}, Kp\mathrm{K_p}= 0.492 atm at 300K. Kc\mathrm{K_c} for the reaction…EasyNumerical value
  16. 31 Jan 2024, Shift 1 · Q63For the given reaction, choose the correct expression of KC\mathrm{K_C} from the following :-…EasySingle correct
  17. 31 Jan 2024, Shift 2 · Q64A(g)⇌B(g)+C2(g)\mathrm{A_{(g)}\rightleftharpoons B_{(g)}+\frac{C}{2}{}_{(g)}} The correct relationship between Kp\mathrm{K_p}, α\alpha and equilibrium…MediumSingle correct
  18. 6 Apr 2023, Shift 1 · Q62For a concentrated solution of a weak electrolyte (KeqK_{eq} = equilibrium constant) A2B3\mathrm{A_2B_3} of concentration 'c', the degree of…MediumSingle correct
  19. 11 Apr 2023, Shift 1 · Q85A mixture of 1 mole of H2O\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
  20. 24 Jun 2022, Shift 1 · Q64For a reaction at equilibrium A(g)⇌B(g)+12C(g)\mathrm{A(g)} \rightleftharpoons \mathrm{B(g)}+\frac{1}{2}\mathrm{C(g)} the relation between dissociation…MediumSingle correct
  21. 25 Jul 2021, Shift 1 · Q57For the reaction A+B⇌2C\mathrm{A+B\rightleftharpoons 2C} the value of equilibrium constant is 100 at 298 K. If the initial concentration of…MediumNumerical value
  22. 9 Jan 2020, Shift 2 · Q30In the figure shown below reactant A (represented by square) is in equilibrium with product B (represented by circle). The equilibrium…EasySingle correctHas a figure
  23. 6 Sep 2020, Shift 2 · Q44The value of Kc\mathrm{K_c} is 64 at 800 K for the reaction N2(g)+3H2(g)⇌2NH3(g)\mathrm{N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)} The value of…EasySingle correct