JEE Chemistry

Equilibrium Basics: JEE Questions & Solutions

22 previous-year JEE Chemistry questions on Equilibrium Basics, each with a worked step-by-step solution.

Basic

Previous-year questions

  1. 01Consider the general reaction given below at 400 K: xA(g) ⇌ yB(g). The values of K_p and K_c are studied under the same condition of…MCQMediumJEE 2026
  2. 02For the following gas phase equilibrium reaction at constant temperature, NH₃(g) = 1/2N₂(g) + 3/2H₂(g) if the total pressure is √3 atm and…NVAMediumJEE 2026
  3. 03X₂(g) + Y₂(g) ⇌ 2Z(g). Equilibrium moles of X₂, Y₂, Z are 3, 3, 9 mol (in 1 L). 10 mol of Z(g) is added. New equilibrium moles of Z(g) is.…NVAMediumJEE 2026
  4. 04Consider the following gaseous equilibrium in a closed container of volume V at temperature T: P₂(g) + Q₂(g) ⇌ 2PQ(g) Initially, 2 moles…MCQMediumJEE 2026
  5. 05Observe 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…MCQEasyJEE 2026
  6. 06A vessel at 1000 K contains CO₂ with a pressure of 0.5 atm. Some of CO₂ is converted into CO on addition of graphite. If total pressure at…MCQMediumJEE 2025
  7. 07Consider the reaction: X₂Y(g) ⇌ X₂(g) + 1/2 Y₂(g) The equation representing the correct relationship between the degree of dissociation x…MCQMediumJEE 2025
  8. 0837.8 g N₂O₅ was taken in a 1 L reaction vessel and allowed to undergo the following reaction at 500 K: 2N₂O₅(g) → 2N₂O₄(g) + O₂(g) The…NVAMediumJEE 2025
  9. 09For the reaction, H₂(g) + I₂(g) ⇌ 2HI(g) Attainment of equilibrium is predicted correctly by:MCQEasyJEE 2025
  10. 10At temperature T, compound AB₂ dissociates as AB_2(g) ⇌ AB_(g) + 1/2 B_2(g), having degree of dissociation x (small compared to unity). The…MCQMediumJEE 2025
  11. 11Consider the following equilibrium, CO(g) + 2H₂(g) ⇌ CH₃OH(g) 0.1 mol of CO along with a catalyst is present in a 2 dm³ flask maintained at…NVAMediumJEE 2025
  12. 12Given below are two statements: Statement I: A catalyst cannot alter the equilibrium constant K_c of the reaction, temperature remaining…MCQEasyJEE 2025
  13. 13The equilibrium constant for decomposition of H₂O (g) H₂O(g) ⇌ H₂(g) + 1/2 O₂(g) (Δ G^° = 92.34 kJ mol⁻¹) is 8.0 × 10⁻³ at 2300 K and total…NVAMediumJEE 2025
  14. 14The equilibrium constant for the formation of NH₃ from N₂ and H₂, given [N₂] = 2×10⁻² M, [H₂] = 3×10⁻² M, [NH₃] = 1.5×10⁻² M at 500 K, is:MCQEasyJEE 2024
  15. 15For the given reaction, choose the correct expression of K_C from the following: Fe³⁺_(aq) + SCN⁻_(aq) ⇌ (FeSCN)²⁺_(aq)MCQEasyJEE 2024
  16. 16Water decomposes at 2300 K: H₂O(g) ⇌ H₂(g) + 1/2 O₂(g) The percent of water decomposing at 2300 K and 1 bar is (Nearest integer).…NVAMediumJEE 2023
  17. 17At 298 K: N₂ + 3H₂ ⇌ 2NH₃, K₁ = 4 × 10⁵ N₂ + O₂ ⇌ 2NO, K₂ = 1.6 × 10¹² H₂ + 1/2O₂ ⇌ H₂O, K₃ = 1.0 × 10⁻¹³ Based on the above equilibria,…NVAMediumJEE 2023
  18. 18For reaction: SO₂(g) + 1/2 O₂(g) ⇌ SO₃(g) K_p = 2 × 10¹² at 27^° C and 1 atm pressure. The K_c for the same reaction is (Nearest integer).…NVAEasyJEE 2023
  19. 19(i) X(g) ⇌ Y(g) + Z(g), K_p1 = 3 (ii) A(g) ⇌ 2B(g), K_p2 = 1 If the degree of dissociation and initial concentration of both the reactants…NVAMediumJEE 2023
  20. 20The number of correct statement(s) involving equilibria in physical form from the following is: (1) Equilibrium is possible only in a…NVAEasyJEE 2023
  21. 21A mixture of 1 mole of H₂O and 1 mole of CO is taken in a 10 litre container and heated to 725 K. At equilibrium, 40% of water by mass…MCQMediumJEE 2023
  22. 224.5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, 3 moles of HI were found. The equilibrium…NVAEasyJEE 2023

Frequently asked questions

Our bank has 22 previous-year JEE Chemistry questions tagged to Equilibrium Basics, drawn from JEE papers between 2023 and 2026, including 5 from 2026 alone. Each comes with a full step-by-step solution.

Equilibrium Basics is rated Basic overall for JEE Chemistry. The PYQs on this page break down as 14 medium, 8 easy.

Of the 22 previous-year questions on Equilibrium Basics, 11 are multiple-choice (MCQ) and 11 are numerical-value (NVA) questions.

Based on recent paper analysis, Equilibrium Basics is worth about 2 marks in JEE Main. It sits in Equilibrium, a Class 11 Chemistry chapter.

More Equilibrium topics

Ionic Equilibria & pH14Solubility Product10Le Chatelier's Principle7Buffer Solutions6Hydrolysis of Salts2

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