Ionic Equilibrium — JEE Main PYQs & Practice Questions

Ionic Equilibrium is a Chemistry chapter in the JEE Main syllabus. This page brings together 97 previous-year and practice questions on Ionic Equilibrium, organised into 6 topics: Acid-Base Concepts, pH and pKa, Buffer Solutions, Salt Hydrolysis, Common Ion Effect and Solubility Product. Most questions come with a step-by-step solution you can work through free in PrepWiser.

Download Ionic Equilibrium JEE Main PYQs as a free PDF (with answer key)

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Chapter weightage: how many questions each chapter had per shift in the 2024–26 papers.

Acid-Base Concepts

• Consider the dissociation equilibrium of the following weak acid HA⇌ H⁺(aq)+A⁻(aq) If…
• The first and second ionization constants of H₂X are 2.5× 10⁻⁸ and 1.0× 10⁻¹³…
• A compound 'X' is a weak acid and it exhibits colour change at pH close to the…
• Given below are two statements: one is labelled as Assertion A and the other is labelled…
• The exact volumes of 1 M NaOH solution required to neutralise 50 mL of 1 M H₃PO₃…
• 10 mL of 2 M NaOH solution is added to 20 mL of 1 M HCl solution kept in a beaker. Now…
• The first and second ionization constants of a weak dibasic acid H₂A are 8.1× 10⁻⁸ and…
• Given below are two statements one is labelled as Assertion A and the other is labelled…
• Given below are two statements. Statement I : In the titration between strong acid and…
• Given is a concentrated solution of a weak electrolyte AₓB_y of concentration ' c ' and…
• While titrating dilute HCl solution with aqueous NaOH, which of the following will not…
• Which of the following compound CANNOT act as a Lewis base?
• The strength of an aqueous NaOH solution is most accurately determined by titrating…
• The incorrect statement for the use of indicators in acid-base titration is :

pH and pKa

• An analyst wants to convert 1 L HCl of pH=1 to a solution of HCl of pH 2. The volume of…
• The pH of a 0.01 M weak acid HX(Kₐ=4 × 10⁻¹⁰) is found to be 5 . Now the acid solution…
• pH of water is 7 at 25° C. If water is heated to 80° C., it's pH will :
• Millimoles of calcium hydroxide required to produce 100 mL of the aqueous solution of pH…
• Which of the following statement(s) is/are correct? (A) The pH of 1 × 10⁻⁸ M HCl…
• x mg of Mg(OH)₂( molar mass =58) is required to be dissolved in 1.0 L of water to…
• Sulphurous acid (H₂SO₃) has Ka₁ = 1.7 × 10⁻² and Ka₂ = 6.4 × 10⁻⁸. The pH of 0.588 M…
• The titration curve of weak acid vs. strong base with phenolphthalein as indictor) is…
• The plot of pH-metric titration of weak base NH₄ OH vs strong acid HCl looks like :
• When the hydrogen ion concentration [H⁺] changes by a factor of 1000, the value of pH of…
• The pH of a solution obtained by mixing 50 mL of 1 M HCl and 30 mL of 1 M NaOH is x ×…
• Two solutions, A and B, each of 100L was made by dissolving 4g of NaOH and 9.8 g of…
• A weak acid HA has degree of dissociation x . Which option gives the correct expression…
• An aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water…
• If 1 mM solution of ethylamine produces pH=9, then the ionization constant (K_b) of…
• pH value of 0.001 M NaOH solution is ____________.
• Assuming that Ba(OH)₂ is completely ionised in aqueous solution under the given…
• A soft drink was bottled with a partial pressure of CO₂ of 3 bar over the liquid at room…
• For the following Assertion and Reason, the correct option is : Assertion : The pH of…
• 200 mL of 0.01 M HCl is mixed with 400 mL of 0.01 M H₂ SO₄. The pH of the mixture is…

Buffer Solutions

• In order to prepare a buffer solution of pH 5.74, sodium acetate is added to acetic…
• 20 mL of 0.1 M NaOH is added to 50 mL of 0.1 M acetic acid solution. The pH of the…
• An acidic buffer is obtained on mixing :
• Given below are two statements : Statement (I) : A Buffer solution is the mixture of a…
• 20 mL of 0.1 M NH₄ OH is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is…
• 20 mL of a solution of acetic acid required 28.4 mL of 0.1 M NaOH for its…
• One litre buffer solution was prepared by adding 0.10 mol each of NH₃ and NH₄ Cl in…
• 3 g of acetic acid is added to 250 mL of 0.1 M HCL and the solution made up to 500 mL…
• Arrange the following resultant mixtures in increasing order of their pH values A. 10…
• Consider a weak base ' B ' of pK_b=5.699. ' x ' mL of 0.02 M HCl and ' y ' mL of 0.02 M…
• The OH⁻ concentration in a mixture of 5.0 mL of 0.0504 M NH₄Cl and 2 mL of 0.0210 M NH₃…
• Which of the following mixture gives a buffer solution with pH=9.25 ? Given…
• The dissociation constant of acetic acid is x×10⁻⁵. When 25 mL of 0.2 M CH₃COONa…
• 50 mL of 0.1 M CH₃COOH is being titrated against 0.1 M NaOH. When 25 mL of NaOH has been…
• The pH of a solution obtained by mixing 5 mL of 0.1MNH₄OH solution with 250 mL of…
• A student needs to prepare a buffer solution of propanoic acid and its sodium salt with…
• Class XII students were asked to prepare one litre of buffer solution of pH 8.26 by…
• Given below are two statements : Statement I : Sodium dichromate and potassium…
• The pH of an aqueous solution containing 1 M benzoic acid (pKₐ=4.20) and 1 M sodium…
• A litre of buffer solution contains 0.1 mole of each of NH₃ and NH₄Cl. On the addition…

Salt Hydrolysis

• Kₐ for CH₃ COOH is 1.8 × 10⁻⁵ and K_b for NH₄ OH is 1.8 × 10⁻⁵. The pH of ammonium…
• If the pKa of lactic acid is 5, then the pH of 0.005 M calcium lactate solution at 25°C…
• Arrange the following solutions in the decreasing order of pOH : (A) 0.01 M HCl (B) 0.01…
• The pH of ammonium phosphate solution, if pkₐ of phosphoric acid and pk b of ammonium…
• Given below are two statements : Statement (I) : Aqueous solution of ammonium carbonate…

Common Ion Effect

• The solubility of CdSO₄ in water is 8.0 × 10⁻⁴ mol L⁻¹. Its solubility in 0.01 M H₂SO₄…
• Consider two Group IV metal ions X²⁺ and Y²⁺. A solution containing 0.01MX²⁺ and…
• Given below are two statements : Statement I : On passing HCl_((g)) through a saturated…
• 0.01 moles of a weak acid HA (Kₐ = 2.0 × 10⁻⁶) is dissolved in 1.0 L of 0.1 M HCl…
• M₃ A₂ is a sparingly soluble salt of molar mass y g mol⁻¹ and solubility x g L⁻¹. The…
• The solubility product constants of Ag₂CrO₄ and AgBr are 32x and 4y respectively at 298…

Solubility Product

• 25 mL of silver nitrate solution (1M) is added dropwise to 25 mL of potassium iodide…
• The stoichiometry and solubility product of a salt with the solubility curve given below…
• A solution is 0.1 M in Cl⁻ and 0.001 M in CrO₄²⁻. Solid AgNO₃ is gradually added to it…
• The Kₛₚ for the following dissociation is 1.6 × 10 –5 PbCl₂₍ₛ₎ ⇋ Pb_((aq))²⁺ +…
• For the following Assertion and Reason , the correct option is Assertion (A): When Cu…
• The solubility of AgCN in a buffer solution of pH = 3 is x. The value of x is : [Assume…
• A₃B₂ is a sparingly soluble salt of molar mass M (g mol⁻¹) and solubility x g L⁻¹. The…
• The molar solubility(s) of zirconium phosphate with molecular formula (Zr⁴⁺)₃(PO₄³⁻)₄ is…
• Which alkaline earth metal has the highest solubility product for its sulfate?
• For a sparingly soluble salt AB₂, the equilibrium concentrations of A²⁺ ions and B⁻ ions…
• Which of the following happens when NH₄ OH is added gradually to the solution containing…
• Solubility of calcium phosphate (molecular mass, M) in water is W_g per 100 mL at 25° C…
• The solubility product of Cr(OH)₃ at 298 K is 6.0 × 10 –31 . The concentration of…
• The solubility product of BaSO₄ is 1 × 10⁻¹⁰ at 298 K. The solubility of BaSO₄ in 0.1 M…
• The pH at which Mg(OH)₂[ Kₛₚ=1 × 10⁻¹¹] begins to precipitate from a solution containing…
• The solubility product of PbI₂ is 8.0 × 10⁻⁹. The solubility of lead iodide in 0.1 molar…
• The solubility of AgCl will be maximum in which of the following?
• If equal volumes of A B₂ and X Y (both are salts) aqueous solutions are mixed, which of…
• The Kₛₚ for bismuth sulphide (Bi₂S₃) is 1.08 × 10⁻⁷³. The solubility of Bi₂S₃ in mol L⁻¹…
• The solubility of Ca(OH)₂ in water is : [Given : The solubility product of Ca(OH)₂ in…

More Chemistry chapters

• Mole Concept & Stoichiometry
• Atomic Structure
• Gaseous State
• Chemical Thermodynamics
• Chemical Equilibrium
• Redox Reactions
• Solutions & Colligative Properties
• Electrochemistry
• Chemical Kinetics
• Solid State
• Surface Chemistry
• Nuclear & Radiochemistry
• Periodic Table & Periodicity
• Chemical Bonding & Molecular Structure
• Hydrogen & s-Block Elements
• p-Block Elements — Part I (Group 13 & 14)
• Environmental Chemistry
• p-Block Elements — Part II (Group 15-18)
• d & f Block Elements
• Coordination Compounds
• Metallurgy
• Qualitative Analysis — Salt Analysis
• Purification & Characterisation of Organic Compounds
• General Organic Chemistry (GOC)
• Hydrocarbons — Alkanes
• Hydrocarbons — Alkenes & Alkynes
• Hydrocarbons — Aromatic (Arenes)
• Halogen Derivatives — Haloalkanes & Haloarenes
• Alcohols, Phenols & Ethers
• Aldehydes & Ketones
• Carboxylic Acids & Their Derivatives
• Amines & Diazonium Salts
• Carbohydrates & Biomolecules
• Polymers
• Chemistry in Everyday Life
• Practical Organic Chemistry

Frequently asked questions

How many Ionic Equilibrium questions are there for JEE Main?

PrepWiser has 97 Ionic Equilibrium questions for JEE Main, grouped into 6 topics such as Acid-Base Concepts, pH and pKa and Buffer Solutions.

Are these Ionic Equilibrium questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Ionic Equilibrium questions?

Open any Ionic Equilibrium question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.