Jump to a section

Chemistry - Ionic Equilibrium

Practise 155 JEE Main previous year questions on Ionic Equilibrium, compiled from papers spanning 2002 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Main tests.

Ionic Equilibrium has been asked in 22 of the 25 years of JEE Main papers analysed (2002–2026), with 155 questions in all. 21% of them were easy, 54% moderate and 25% tough. Most of its questions came from 2021, with 17 questions that year. In the last three years (2024–2026) it had 30 questions across 49 papers, about 0.6 per paper.

The chapter's 6 topics are not weighted equally: Solubility (54 questions, 35%), PH of solutions (42 questions, 27%), and Theories of Acids and Bases (26 questions, 17%) have been asked the most. Over the last five years the most frequent topics have been PH of solutions (24), Solubility (19), and Buffer solutions (11). Solubility has produced the most tough questions (12).

  1. 1Given is a concentrated solution of a weak electrolyte of concentration 'c' and dissociation constant 'K'. The degree of dissociation is giv06 Apr, 2026 (E)Theories of Acids and Bases
  2. 2is a sparingly soluble salt of molar mass g mol and solubility g L . The ratio of the molar concentration of the anion ( ) to the solubility05 Apr, 2026 (M)Solubility
  3. 3Arrange the following resultant mixtures in increasing order of their pH values A. mL M Ca(OH) + mL M HCl B. mL M H SO + mL M Ca(OH) C. mL M05 Apr, 2026 (M)PH of solutions
  4. 4The pH of a solution obtained by mixing mL of M solution with mL of M solution is _____ . (Nearest integer) Given:04 Apr, 2026 (M)Buffer solutions
  5. 5mL of a solution of acetic acid required mL of M NaOH for its neutralization. A solution (X) was prepared by mixing mL of the above acetic a04 Apr, 2026 (E)PH of solutions
  6. 6The solubility product constants of and are and respectively at K. The value of can be expressed as :02 Apr, 2026 (M)Solubility
  7. 7The first and second ionization constants of a weak dibasic acid are and respectively. mol of was dissolved in L of M HCl solution. The conc02 Apr, 2026 (E)PH of solutions
  8. 8At , mL of M weak monoprotic acid HX is titrated against M NaOH. The pH of the solution (a) at the start of the titration (when NaOH has not02 Apr, 2026 (E)PH of solutions
  9. 9Consider a weak base ' B ' of . ' ' mL of 0.02 M HCl and ' y ' mL of 0.02 M weak base ' B ' are mixed to make 100 mL of a buffer of pH 9 at 28 Jan, 2026 (M)Buffer solutions
  10. 10Consider the dissociation equilibrium of the following weak acid If the pKa of the acid is 4, then the pH of 10 mMHA solution is .(Nearest i28 Jan, 2026 (M)PH of solutions
  11. 11Consider two Group IV metal ions and . A solution containing and is saturated with . The pH at which the metal sulphide YS will form as a pr24 Jan, 2026 (M)Solubility
  12. 12of pure HCl was used to make an aqueous solution. 25.0 mL of solution is used when the HCl solution was titrated against it. The numerical v23 Jan, 2026 (M)Theories of Acids and Bases
  13. 13Which of the following mixture gives a buffer solution with ? Given :22 Jan, 2026 (E)Buffer solutions
  14. 14The first and second ionization constants of are and respectively. The concentration of in solution is . (Nearest Integer)21 Jan, 2026 (E)PH of solutions
  15. 15The equilibrium constant for decomposition of is at 2300 K and total pressure at equilibrium is 1 bar. Under this condition, the degree of d08 Apr, 2025 (E)Ionic Product of Water
  16. 16An 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 w07 Apr, 2025 (M)Theories of Acids and Bases
  17. 17Only litre buffer solution was prepared by adding 0.10 mol each of and in deionised water. The change in pH on addition of 0.05 mol of HCl t07 Apr, 2025 (E)Buffer solutions
  18. 18The pH of a 0.01 M weak acid is found to be 5. Now the acid solution is diluted with excess of water so that the pH of the solution changes 04 Apr, 2025 (M)PH of solutions
  19. 19x mg of molar mass is required to be dissolved in 1.0 L of water to produce a pH of 10.0 at 298 K. The value of x is ________ mg. (Nearest i04 Apr, 2025 (E)Theories of Acids and Bases
  20. 2010 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now, 10 mL of this mixture is poured into a volumetric fl03 Apr, 2025 (E)PH of solutions
  21. 21If equal volumes of \( {AB}_2\) and XY (both are salts) aqueous solutions are mixed, which of the following combination will give a precipit02 Apr, 2025 (M)Solubility
  22. 22Total number of non bonded electrons present in ion based on Lewis theory is29 Jan, 2025 (E)Theories of Acids and Bases
  23. 23A weak acid HA has degree of dissociation x . Which option gives the correct expression of ( pH )?28 Jan, 2025 (M)Ionic Product of Water
  24. 24Arrange the following in increasing order of solubility product :28 Jan, 2025 (E)Solubility
  25. 25for is . What is the molar solubility of this salt in water?24 Jan, 2025 (M)Solubility
  26. 26Which of the following happens when is added gradually to the solution containing 1 M and ions? Given : and at 298 K .23 Jan, 2025 (M)Solubility
  27. 27If 1 mM solution of ethylamine produces , then the ionization constant of ethylamine is . The value of is ______ (nearest integer). [The deg23 Jan, 2025 (M)PH of solutions
  28. 28pH of water is 7 at . If water is heated to ., it's pH will :23 Jan, 2025 (E)PH of solutions
  29. 29The molar solubility(s) of zirconium phosphate with molecular formula is given by relation :22 Jan, 2025 (E)Solubility
  30. 30For a sparingly soluble salt \( {AB}_2\), the equilibrium concentrations of \( {A}^{2+}\) ions and \(B^{-}\)ions are \(1.2 10^{-4} {M}\) and09 Apr, 2024 (E)Solubility
  31. 31Given below are two statements : Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular qu08 Apr, 2024 (E)Buffer solutions
  32. 32Given below are two statements : Statement I : On passing \( {HCl}_{( {g})}\) through a saturated solution of \( {BaCl}_2\), at room tempera05 Apr, 2024 (E)Solubility
  33. 33K a for CH 3 COOH is 1 . 8 × 10 - 5 and K b for NH 4 OH is 1 . 8 × 10 - 5 . The pH of ammonium acetate solution will be01 Feb, 2024 (M)Buffer solutions
  34. 34Solubility of calcium phosphate (molecular mass, M ) in water is W g per 100 mL at 25 ° C . Its solubility product at 25 ° C will be approxi01 Feb, 2024 (E)Solubility
  35. 35The pH at which Mg ( OH ) 2 K sp = 1 × 10 - 11 begins to precipitate from a solution containing 0 . 10 M Mg 2 + ions is ______.30 Jan, 2024 (M)Solubility
  36. 36The pH of an aqueous solution containing 1 M benzoic acid pK a = 4 . 20 and 1 M sodium benzoate is 4 . 5 . The volume of benzoic acid soluti30 Jan, 2024 (E)Buffer solutions
  37. 37Which of the following is strongest Bronsted base?27 Jan, 2024 (M)Theories of Acids and Bases
  38. 38Given below are two statements : Statement (I) : Aqueous solution of ammonium carbonate is basic. Statement (II) : Acidic/basic nature of sa27 Jan, 2024 (M)Theories of Acids and Bases
  39. 39Which of the following statement(s) is/are correct? (A) The pH of 1 10 8 M HCl solution is 8 . (B) The conjugate base of H 2 PO 4 - is HPO 415 Apr, 2023 (M)Theories of Acids and Bases
  40. 4025 . 0 mL of 0 . 050 M Ba NO 3 2 is mixed with 25 . 0 mL of 0 . 020 M NaF . K sp of BaF 2 is 0 . 5 10 6 at 298 K . The ratio of Ba 2 + F - 213 Apr, 2023 (M)Solubility
  41. 4120 mL of 0 . 1 MNaOH is added to 50 mL of 0 . 1 M acetic acid solution. The pH of the resulting solution is 10 - 2 . (Nearest integer) Given13 Apr, 2023 (E)Salt Hydrolysis
  42. 42An analyst wants to convert 1 L HCl of pH = 1 to a solution of HCl of pH = 2 . The volume of water needed to do this dilution is _____ mL . 12 Apr, 2023 (M)PH of solutions
  43. 43The titration curve of weak acid vs. strong base with phenolphthalein as indicator is shown below. The K phenolphthalein = 4 10 - 10 Given: 08 Apr, 2023 (M)PH of solutions
  44. 44Given below are two statements: Statement-I : Methyl orange is a weak acid. Statement-II : The benzenoid form of methyl orange is more inten08 Apr, 2023 (E)PH of solutions
  45. 45The solubility product of BaSO 4 is 1 10 - 10 at 298 K . The solubility of BaSO 4 in 0 . 1 M K 2 SO 4 ( aq ) solution is ------ 10 - 9 g L -08 Apr, 2023 (E)Solubility
  46. 46Incorrect statement for the use of indicator in acid-base titration is:31 Jan, 2023 (E)Ionic Product of Water
  47. 47At 298 K , the solubility of silver chloride in water is 1 . 434 10 - 3 g L - 1 . The value of - logK sp for silver chloride is (Given mass 31 Jan, 2023 (E)Solubility
  48. 48600 mL of 0 . 01 M HCl is mixed with 400 mL of 0 . 01 M H 2 SO 4 . The pH of the mixture is _____ 10 - 2 . (Nearest integer) [Given log 2 = 30 Jan, 2023 (M)PH of solutions
  49. 49Millimoles of calcium hydroxyide required to produce 100 mL of the aqueous solution of pH 12 is x 10 - 1 . The value of x is _____ (Nearest 29 Jan, 2023 (M)PH of solutions
  50. 50The volume of HCl , containing 73 g L - 1 , required to completely neutralise NaOH obtained by reacting 0 . 69 g of metallic sodium with wat29 Jan, 2023 (E)PH of solutions

Frequently Asked Questions

1.How many questions are available for Ionic Equilibrium?

This chapter includes 155 questions compiled from JEE Main papers spanning 2002 to 2026.

2.Are these questions only from JEE Main, or from other exams too?

These are JEE Main questions specifically for the Ionic Equilibrium chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is Ionic Equilibrium an important chapter for JEE Main Chemistry?

Ionic Equilibrium has appeared in 22 of the 25 years of JEE Main papers covered here, with 155 questions across 122 papers - about one per paper it appears in.

4.What is the difficulty level of Ionic Equilibrium questions in JEE Main?

Of the 155 questions analysed for this chapter, 21% are easy, 54% moderate and 25% tough. 2021 had the most, with 17 questions.

5.Which topics in Ionic Equilibrium should I focus on?

These topics have carried the most weightage in Ionic Equilibrium:

  • Solubility - 54 questions (35%)
  • PH of solutions - 42 questions (27%)
  • Theories of Acids and Bases - 26 questions (17%)
  • Solubility has produced the most tough questions (12).
6.Is Ionic Equilibrium's weightage in JEE Main going up or down?

Across all 122 papers analysed, Ionic Equilibrium has averaged about 1.3 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.6 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.