Ionic Equilibrium JEE Main PYQs PDF, 2020–2026

Ionic Equilibrium questions per year

in the free PDF asked, not in the PDFThe PDF only has questions we can print in full with a checked answer, so it holds 96 of the 99 asked.

Topic-wise weightage by year

How many Ionic Equilibrium questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Swipe the table sideways for older years.

Newest questions (2026)

The 12 newest of the 14 JEE Main 2026 Ionic Equilibrium questions in the free PDF, latest shift first.

1. JEE Main 2026 · 6 Apr · Shift 2 · Acid-Base Concepts

   Given is a concentrated solution of a weak electrolyte $A_{x}B_{y}$ of concentration ' $c$ ' and dissociation constant ' K '. The degree of dissociation is given by :

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2. JEE Main 2026 · 5 Apr · Shift 1 · Common Ion Effect

   ${\mathrm{M}}_{3}{\ \mathrm{A}}_{2}$ is a sparingly soluble salt of molar mass $y{\ \mathrm{g}}{\ \mathrm{mol}}^{{-1}}$ and solubility $x{\ \mathrm{g}}{\ \mathrm{L}}^{{-1}}$. The ratio of the molar concentration of the anion $\left({\mathrm{A}}^{{3-}}\right)$ to the solubility product of the salt is

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3. JEE Main 2026 · 5 Apr · Shift 1 · Buffer Solutions

   Arrange the following resultant mixtures in increasing order of their pH values

   A. $10{\ \mathrm{mL}}0.2{\mathrm{M}}{\mathrm{Ca}}({\mathrm{OH}})_{2}+25{\ \mathrm{mL}}0.1{\mathrm{M}}{\mathrm{HCl}}$

   B. $10{\ \mathrm{mL}}0.01{\mathrm{M}}{\mathrm{H}}_{2}{\mathrm{SO}}_{4}+10{\ \mathrm{mL}}0.01{\mathrm{M}}{\mathrm{Ca}}({\mathrm{OH}})_{2}$

   C. $10{\ \mathrm{mL}}0.1{\mathrm{M}}{\mathrm{H}}_{2}{\mathrm{SO}}_{4}+10{\ \mathrm{mL}}0.1{\mathrm{M}}{\mathrm{KOH}}$

   Choose the correct answer from the options given below :

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4. JEE Main 2026 · 5 Apr · Shift 1 · Buffer Solutions

   Given below are two statements :

   Statement I : Sodium dichromate and potassium dichromate are classified as primary standards in titrimetric analysis.

   Statement II : Phenolphthalein is a weak base, therefore it dissociates in acidic medium.

   In the light of the above statements, choose the correct answer from the options given below

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5. JEE Main 2026 · 4 Apr · Shift 1 · Buffer Solutions

   The pH of a solution obtained by mixing 5 mL of $0.1{\mathrm{M}}{\mathrm{NH}}_{4}{\mathrm{OH}}$ solution with 250 mL of $0.1{\mathrm{M}}{\mathrm{NH}}_{4}{\mathrm{Cl}}$ solution is $\_\_\_\_$ $\times {10}^{{-2}}$.(Nearest integer) Given: ${\mathrm{pK}}_{{{\mathrm{b}}}}({\mathrm{NH}}_{4}{\mathrm{OH}})=4.74$

   $\begin{array}{cc} & \log 2=0.30 \\ & \log 3=0.48 \\ & \log 5=0.70\end{array}$

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6. JEE Main 2026 · 4 Apr · Shift 2 · Buffer Solutions

   20 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 the above acetic acid and 14.2 mL of 0.1 M NaOH solution. What is the pH of the solution $({\mathrm{X}})$ ? $({\mathrm{pK}}_{{{\mathrm{a}}}}$ value of acetic acid is 4.75).

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7. JEE Main 2026 · 2 Apr · Shift 2 · Acid-Base Concepts

   The first and second ionization constants of a weak dibasic acid H₂A are $8.1\times {10}^{{-8}}$ and $1.0\times {10}^{{-13}}$ respectively. 0.1 mol of H₂A was dissolved in 1 L of 0.1 M HCl solution. The concentration of HA^- in the resultant solution is:

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8. JEE Main 2026 · 2 Apr · Shift 2 · Buffer Solutions

   At 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 (when NaOH has not been added) and (b) when 10 mL of NaOH is added respectively, are :

   Given :
   $K_{a}=5\times {10}^{{-4}}$
   ${\mathrm{p}}K_{a}=3.3$
   $\alpha\ll 1$

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9. JEE Main 2026 · 2 Apr · Shift 1 · Common Ion Effect

   The solubility product constants of ${\mathrm{Ag}_{2}\mathrm{CrO}_{4}}$ and ${\mathrm{AgBr}}$ are $32x$ and $4y$ respectively at 298 K.
   
   The value of $\left(\frac{\text{molarity of}{\mathrm{Ag}_{2}\mathrm{CrO}_{4}}}{\text{molarity of}{\mathrm{AgBr}}}\right)$ can be expressed as :

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10. JEE Main 2026 · 28 Jan · Shift 1 · Acid-Base Concepts

    Consider the dissociation equilibrium of the following weak acid

    ${\mathrm{HA}}\rightleftharpoons {\mathrm{H}}^{{+}}({\mathrm{aq}})+{\mathrm{A}}^{{-}}({\mathrm{aq}})$

    If the pKa of the acid is 4 , then the pH of 10 mM HA solution is $\_\_\_\_$ .(Nearest integer)

    [Given: The degree of dissociation can be neglected with respect to unity]

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11. JEE Main 2026 · 28 Jan · Shift 1 · Buffer Solutions

    Consider a weak base ' B ' of ${\mathrm{pK}}_{{{\mathrm{b}}}}=5.699$. ' $x$ ' 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 ${25}^{{\circ}}{\mathrm{C}}$. The values of ' $x$ ' and ' $y$ ' respectively are :

    [Given : $\log 2=0.3010,\log 3=0.4771,\log 5=0.699$ ]

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12. JEE Main 2026 · 24 Jan · Shift 1 · Common Ion Effect

    Consider two Group IV metal ions ${\mathrm{X}}^{{2+}}$ and ${\mathrm{Y}}^{{2+}}$.

    A solution containing $0.01{\mathrm{M}}{\mathrm{X}}^{{2+}}$ and $0.01{\mathrm{M}}{\mathrm{Y}}^{{2+}}$ is saturated with ${\mathrm{H}}_{2}{\ \mathrm{S}}$. The pH at which the metal sulphide YS will form as a precipitate is $\_\_\_\_$ . (Nearest integer)

    (Given: ${\mathrm{K}}_{{{\mathrm{sp}}}}({\mathrm{XS}})=1\times {10}^{{-22}}$ at ${25}^{{\circ}}{\mathrm{C}},{\mathrm{K}}_{{{\mathrm{sp}}}}({\mathrm{YS}})=4\times {10}^{{-16}}$ at ${25}^{{\circ}}{\mathrm{C}}$, $[{\mathrm{H}}_{2}{\ \mathrm{S}}]=0.1{\mathrm{M}}$ in solution, ${\mathrm{K}}_{{a1}}\times {\mathrm{K}}_{{a2}}({\mathrm{H}}_{2}{\ \mathrm{S}})=1.0\times {10}^{{-21}},\log 2=0.30$, $\log 3=0.48,\log 5=0.70)$

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Sample questions from recent papers

The free PDF above has all 96 questions grouped by topic, with an answer key.

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