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Chemistry - Ionic Equilibrium

Practise 32 WBJEE previous year questions on Ionic Equilibrium, compiled from papers spanning 2010 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 WBJEE tests.

Ionic Equilibrium has been asked in 16 of the 18 years of WBJEE papers analysed (2009–2026), with 32 questions in all. 19% of them were easy, 53% moderate and 28% tough. Most of its questions came from 2021, with 5 questions that year. In the last three years (2024–2026) it had 5 questions across 3 papers, about 1.7 per paper.

The chapter's 6 topics are not weighted equally: PH of solutions (10 questions, 31%), Buffer solutions (8 questions, 25%), and Solubility (7 questions, 22%) have been asked the most. PH of solutions has also led over the last five years, with 2 questions. Buffer solutions has produced the most tough questions (5).

  1. 1A buffer solution contains ml of (M) and ml of (M) . ml of water is added subsequently to the buffer solution. The pH before and after dilut2026Buffer solutions
  2. 2Increasing order of solubility of AgCl in (i) , (ii) 1 M NaCl (aq.), (iii) (aq.) and (iv) (aq.) solution2025Solubility
  3. 3Equal volume of two solutions A and B of a strong acid having and respectively are mixed together to form a new solution. The pH of the new 2025PH of solutions
  4. 4At , the ionic product of water is . The free energy change for the self-ionization of water in is close to2024Ionic Product of Water
  5. 5pH of solution is2024PH of solutions
  6. 6Which of the following mixtures act(s) as buffer solution?2023Buffer solutions
  7. 7Which of the statements are incorrect?2022Salt Hydrolysis
  8. 8Which one of the following solutions will have highest conductivity?2021Theories of Acids and Bases
  9. 9of weak monoacidic base at is titrated with in water at . The concentration of at equivalence point is , at ,2021PH of solutions
  10. 10Solubility products of the salts of types and at temperature are and respectively. Solubilities (in ) of the salts at temperature are in the2021Solubility
  11. 11A saturated solution of at is . The solubility of in at this temperature will be2021Solubility
  12. 12Aqueous solution of and of identical concentration are provided. The pair (s) of solutions which form a buffer upon mixing is (are)2021Buffer solutions
  13. 13A solution is saturated with and . The is found to be . The concentration of - in the solution would be2020Solubility
  14. 14Which of the following mixtures will have the lowest pH at 298 K?2019PH of solutions
  15. 15Dissolving NaCN in de-ionised water will result in a solution having2017PH of solutions
  16. 16Of the following compounds, which one is the strongest Bronsted acid in a aqueous solution?2017Theories of Acids and Bases
  17. 17The molar solubility (in mol ) of a sparingly soluble salt is . The corresponding solubility product is in terms of ' s given by the relatio2016Solubility
  18. 18In which of the following mixed aqueous solutions, at equilibrium? (1) of of (2) of of 0.1 (3) of of (4) of of2016Buffer solutions
  19. 19The ratio of volumes of (N) to CH COONa 0.1 (N) required to prepare a buffer solution of is (Given, of is2015Buffer solutions
  20. 20Within the list shown below, the correct pair of structures of alanine in ranges and is I. II. III.2015PH of solutions
  21. 21The pH of KOH solution will be2014PH of solutions
  22. 22At , the solubility produet of salt of type is in water. The solubility (in of in water at the sume temperature will be2013Solubility
  23. 23The different colours of litmus in acidic, neutral and basic solutions are, respectively.2013Theories of Acids and Bases
  24. 24At of a aqueous solution will be2013PH of solutions
  25. 25mole of is added to a buffer solution made up of acetic acid and 0.01 M sodium acetate. The final pH of the buffer will be (given, of acetic2013Buffer solutions
  26. 26A mL, solution of ammonium acetate is diluted by adding of water. The pH of the resulting solution will be of acetic acid is nearly equal to2012Salt Hydrolysis
  27. 27The number of acidic protons in are2012Theories of Acids and Bases
  28. 28(N) acetic acid is mixed with solution of NaOH. The pH of the resulting solution is of acetic acid is2012Buffer solutions
  29. 29The \( {pH}\) of an aqueous solution of \( {CH}_3 {COONa}\) of concentrated \( {C}( {M})\) is given by2011PH of solutions
  30. 30The solubility of \( {Ca}_3 ( {PO}_4 )_2\) in water is y moles / litre. Its solubility product is2011Solubility
  31. 31and each of volume are mixed and the volume is made up to by adding of solution. The of the resulting mixture is2010PH of solutions
  32. 32A weak acid of dissociation constant is being titrated with aqueous solution. The at the point of one-third neutralisation of the acid will 2010Buffer solutions

Frequently Asked Questions

1.How many questions are available for Ionic Equilibrium?

This chapter includes 32 questions compiled from WBJEE papers spanning 2010 to 2026.

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

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

3.Is Ionic Equilibrium an important chapter for WBJEE Chemistry?

Ionic Equilibrium has appeared in 16 of the 18 years of WBJEE papers covered here, with 32 questions across 16 papers - about 2 per paper it appears in.

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

Of the 32 questions analysed for this chapter, 19% are easy, 53% moderate and 28% tough. 2021 had the most, with 5 questions.

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

These topics have carried the most weightage in Ionic Equilibrium:

  • PH of solutions - 10 questions (31%)
  • Buffer solutions - 8 questions (25%)
  • Solubility - 7 questions (22%)
  • Buffer solutions has produced the most tough questions (5).
6.Is Ionic Equilibrium's weightage in WBJEE going up or down?

Across all 16 papers analysed, Ionic Equilibrium has averaged about 2.0 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.