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Friday, 9 October

JEE Main Chemistry · Class 11

Equilibrium: JEE Main previous year questions

Equilibrium had 52 questions in the 42 JEE Main shifts Lumi analysed, about 1.1 a shift, asked in 40 of 42 shifts. It ranks 9 of 30 Chemistry chapters by questions; 4% of its questions were hard.

Questions
52
in 40 of 42 shifts
A shift, on average
1.1
of 25 Chemistry questions
Since 2024
+0.1
1.1 a shift in 2017–23, 1.2 in 2024–26
Numerical answer
19
37% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
08161’176’204’214’226’237’249’2515’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20171
  • 20206
  • 20214
  • 20224
  • 20236
  • 20247
  • 20259
  • 202615
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

5 topics and 29 distinct ideas; 15 ideas were asked more than once. Most questions are single correct and calculation.

Topics, by questions

2 questions had no close topic in our taxonomy and are counted for the chapter only.

Ideas asked most
15 repeat

Study it on Lumi

Equilibrium: the interactive lesson

Every question

All 52 Equilibrium questions

Newest first. Each opens with its options and the official answer.

2026 15 questions

  1. 2 Apr 2026, Shift 1 · Q56The solubility product constants of Ag2CrO4\mathrm{Ag_2CrO_4} and AgBr are 32x32x and 4y4y respectively at 298298 K. The value of…MediumSingle correct
  2. 2 Apr 2026, Shift 2 · Q52The first and second ionization constants of a weak dibasic acid H2A\mathrm{H_2A} are 8.1×10−88.1 \times 10^{-8} and 1.0×10−131.0 \times 10^{-13}…HardSingle correct
  3. 2 Apr 2026, Shift 2 · Q56At 25°C, 20.0 mL of 0.2 M weak monoprotic acid HX is titrated against 0.2 M NaOH. The pH of the solution (a) at the start of the titration…MediumSingle correct
  4. 2 Apr 2026, Shift 2 · Q72Consider the following gas phase reaction being carried out in a closed vessel at 25°C. 2A(g)⟶4B(g)+C(g)2A(g) \longrightarrow 4B(g) + C(g) | time (min)…MediumNumerical value
  5. 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
  6. 4 Apr 2026, Shift 1 · Q74The pH of a solution obtained by mixing 55 mL of 0.10.1 M NH4OH\mathrm{NH_4OH} solution with 250250 mL of 0.10.1 M NH4Cl\mathrm{NH_4Cl} solution…MediumNumerical value
  7. 4 Apr 2026, Shift 2 · Q5520 mL of a solution of acetic acid required 28.4 mL of 0.1 M NaOH for its neutralization. A solution (X) was prepared by mixing 20 mL of…EasySingle correct
  8. 4 Apr 2026, Shift 2 · Q69Among Fe3+\mathrm{Fe^{3+}}, Pb2+\mathrm{Pb^{2+}}, Cu2+\mathrm{Cu^{2+}} and Mn2+\mathrm{Mn^{2+}}, identify the one that gets precipitated out while…MediumSingle correct
  9. 5 Apr 2026, Shift 1 · Q55M3A2\mathrm{M_3A_2} is a sparingly soluble salt of molar mass yy g mol−1^{-1} and solubility xx g L−1^{-1}. The ratio of the molar…MediumSingle correct
  10. 5 Apr 2026, Shift 1 · Q56Arrange the following resultant mixtures in increasing order of their pH values A. 10 mL 0.2 M Ca(OH)2\mathrm{Ca(OH)_2} + 25 mL 0.1 M HCl B. 10…MediumOther
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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

2025 9 questions

  1. 2 Apr 2025, Shift 1 · Q56If equal volumes of AB2\mathrm{AB_2} and XY (both are salts) aqueous solutions are mixed, which of the following combination will give a…MediumSingle correct
  2. 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
  3. 2 Apr 2025, Shift 2 · Q55Consider the following chemical equilibrium of the gas phase reaction at a constant temperature :…MediumSingle correct
  4. 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
  5. 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
  6. 4 Apr 2025, Shift 2 · Q71x mg of Mg(OH)2\mathrm{Mg(OH)_2} (molar mass = 58) is required to be dissolved in 1.0 L of water to produce a pH of 10.0 at 298 K. The value of…EasyNumerical value
  7. 7 Apr 2025, Shift 1 · Q54An aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water (ignoring dissociation of water). The pH of HCl solution…EasySingle correct
  8. 7 Apr 2025, Shift 2 · Q72One litre buffer solution was prepared by adding 0.10 mol each of NH3\mathrm{NH_3} and NH4Cl\mathrm{NH_4Cl} in deionised water. The change in…MediumNumerical value
  9. 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

2024 7 questions

  1. 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
  2. 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
  3. 9 Apr 2024, Shift 2 · Q63For a sparingly soluble salt AB2\mathrm{AB_2}, the equilibrium concentrations of A2+\mathrm{A^{2+}} ions and B−\mathrm{B^-} ions are…EasySingle correct
  4. 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
  5. 30 Jan 2024, Shift 2 · Q83The pH of an aqueous solution containing 1M benzoic acid (pKa=4.20\mathrm{pK_a} = 4.20) and 1M sodium benzoate is 4.5. The volume of benzoic…MediumNumerical value
  6. 31 Jan 2024, Shift 1 · Q63For the given reaction, choose the correct expression of KC\mathrm{K_C} from the following :-…EasySingle correct
  7. 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

2023 6 questions

  1. 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
  2. 8 Apr 2023, Shift 2 · Q79Given below are two statements: Statement I : Methyl orange is a weak acid. Statement II : The benzenoid form of methyl orange is more…MediumTwo statements
  3. 8 Apr 2023, Shift 2 · Q85The solubility product of BaSO4\mathrm{BaSO_4} is 1×10−101\times10^{-10} at 298K. The solubility of BaSO4\mathrm{BaSO_4} in 0.1 M K2SO4\mathrm{K_2SO_4}…EasyNumerical value
  4. 11 Apr 2023, Shift 1 · Q6325 mL of silver nitrate solution (1M) is added dropwise to 25 mL of potassium iodide (1.05 M) solution. The ion(s) present in very small…MediumSingle correct
  5. 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
  6. 13 Apr 2023, Shift 2 · Q8520 mL of 0.1 M NaOH is added to 50 mL of 0.1 M acetic acid solution. The pH of the resulting solution is ______ ×10−2\times10^{-2} (Nearest…MediumNumerical value

2022 4 questions

  1. 25 Jul 2022, Shift 1 · Q642020 mL of 0.10.1 M NH4OH\mathrm{NH_4OH} is mixed with 4040 mL of 0.050.05 M HCl. The pH of the mixture is nearest to : (Given :…MediumSingle correct
  2. 28 Jul 2022, Shift 1 · Q85KaK_a for butyric acid (C3H7COOH\mathrm{C_3H_7COOH}) is 2×10−52\times10^{-5}. The pH of 0.2 M solution of butyric acid is __________…EasyNumerical value
  3. 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
  4. 29 Jun 2022, Shift 1 · Q64The solubility of AgCl will be maximum in which of the following ?EasySingle correct

2021 4 questions

  1. 3 Aug 2021, Shift 2 · Q55The pH of the solution resulted when 150 mL of 0.1 M ammonia solution is titrated with 50 mL of 0.1M HCl [pKb(NH3)\mathrm{pK_b(NH_3)} = 4.7] is…MediumNumerical value
  2. 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
  3. 16 Mar 2021, Shift 2 · Q56Sulphurous acid (H2SO3\mathrm{H_2SO_3}) has Ka1=1.7×10−2K_{a_1}=1.7\times10^{-2} and Ka2=6.4×10−8K_{a_2}=6.4\times10^{-8}. The pH of 0.588 M H2SO3\mathrm{H_2SO_3}…MediumNumerical value
  4. 18 Mar 2021, Shift 1 · Q55In order to prepare a buffer solution of pH 5.74, sodium acetate is added to acetic acid. If the concentration of acetic acid in the…EasyNumerical value

2020 6 questions

  1. 8 Jan 2020, Shift 1 · Q26The stoichiometry and solubility product of a salt with the solubility curve given below is, respectively :HardSingle correctHas a figure
  2. 9 Jan 2020, Shift 2 · Q27The solubility product of Cr(OH)3\mathrm{Cr(OH)_3} at 298 K is 6.0×10−316.0\times10^{-31}. The concentration of hydroxide ions in a saturated solution…MediumSingle correct
  3. 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
  4. 2 Sep 2020, Shift 1 · Q27For the following Assertion and Reason, the correct option is Assertion (A) : When Cu (II) and sulphide ions are mixed, they react…MediumAssertion–reason
  5. 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
  6. 6 Sep 2020, Shift 2 · Q47If the solubility product of AB2\mathrm{AB_2} is 3.20×10−11 M33.20\times10^{-11}\ \mathrm{M^3}, then the solubility of AB2\mathrm{AB_2} in pure water…EasyNumerical value

2017 1 questions

  1. 2 Apr 2017 (offline) · Q40pKapK_a of a weak acid (HA) and pKbpK_b of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :EasySingle correct

Pattern: Asked most years.