JEE Main · Chemistry · Equilibrium

Solubility Product: JEE Main previous year questions

Name: Solubility Product: JEE Main previous year questions
Creator: Lumi

25 questions in the 108 JEE Main shifts Lumi analysed, in 7 of 8 years. Pattern: Asked most years. 7 came in 2024–26. Here is how it is asked and which ideas come back.

Questions: 25; in 25 of 108 shifts
Years asked: 7/8; last asked 2026
Chance in a shift: 19%; calibrated model, how we compute it
Weighted estimate: 0.2; model; history: 0.2 a shift on average, typically 0.1–0.2

Key findings

01
Asked in 7 of 8 years with analysed shifts and in 25 of 108 shifts: 25 questions, #126 of 196 topics.
02
36% of its questions since 2020 tested an idea no earlier year had asked; 10 repeated an idea from the year before.
03
The most repeated idea is Solubility-Ksp Relationship, asked 8 times in 8 shifts (2020, 2021, 2022, 2024, 2026), most often as “expression for ratio from solubility in g/l”.
04
JEE Main has asked 7 of the 56 ideas in this topic; 45 have never been asked, directly or inside another question.
05
Mostly asked as single correct (52%); 44% need a numerical answer, 28% are easy and 12% hard.
06
The skill tested most is calculation (80%), then conceptual (8%).

Questions a shift, year by year

Out of the 25 Chemistry questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.

Raw count: 2017: 0 in 1 shift · 2020: 4 in 12 shifts · 2021: 7 in 24 shifts · 2022: 4 in 24 shifts · 2023: 3 in 12 shifts · 2024: 4 in 18 shifts · 2025: 1 in 8 shifts · 2026: 2 in 9 shifts.

Up to 2023: 0.2; a shift, of 25
Since 2024: 0.2; 0.0
Usual gap: 1.0 yrs; between years asking it
Shifts with it: 25/108; 23% of analysed shifts

How it is asked

Difficulty, format and skill

Across all 25 questions on Solubility Product since 2017.

Difficulty

QUESTIONS

7153

Easy7 · 28%
Medium15 · 60%
Hard3 · 12%

Format

Single correct · 13 Q52%
Numerical value · 11 Q44%
Two statements · 1 Q4%

Skill tested

Calculation · 20 Q80%
Conceptual · 2 Q8%
Application · 1 Q4%
Multi-step · 1 Q4%
Data or graph · 1 Q4%

Repeats

New idea, or one asked before?

Each column is a year. Blue questions tested an idea no earlier year had asked; navy ones went back to an idea from an earlier year. 2017 is the first year, so everything in it counts as new. Heights are question counts, and Lumi analysed 1 to 24 shifts a year, so compare the split inside a column rather than heights across years.

’17’20’21’22’23’24’25’26

Idea asked for the first time
Idea asked in an earlier year

Coverage of the topic

JEE Main has asked 7 of the 56 ideas in this topic. 45 have never been asked yet.

745

Asked directly7 · 13%
Touched inside another question4 · 7%
Never asked45 · 80%

Ideas come from Lumi’s JEE syllabus map. A never-asked idea is not a safe skip: across all of JEE Main, 22% of questions since 2024 tested an idea no earlier year had asked.

Drill down

Idea, year, question

Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.

ideaAskedShareYears’17’20’21’22’23’24’25’26

OpenRepeated8 · 32%32%5/823
- 5 Apr ’26 S1 · Q55
  $\mathrm{M_3A_2}$ is a sparingly soluble salt of molar mass $y$ g mol $^{-1}$ and solubility $x$ g L $^{-1}$ . The ratio of the molar…
  mediumSingle correct
- 1 Feb ’24 S2 · Q64
  Solubility of calcium phosphate (molecular mass, M) in water is $\mathrm{W_g}$ per 100 mL at 25 $^\circ$ C. Its solubility product at 25…
  mediumSingle correct
- 27 Jul ’22 S1 · Q86
  At 310 K, the solubility of $\mathrm{CaF_2}$ in water is $2.34 \times 10^{-3}$ g/100 mL. The solubility product of $\mathrm{CaF_2}$ is…
  easyNumerical valueAsked the year before
- 29 Jul ’22 S1 · Q86
  If the solubility product of PbS is $8\times10^{-28}$ , then the solubility of PbS in pure water at 298 K is $x\times10^{-16}$ …
  easyNumerical valueAsked the year before
- 25 Jun ’22 S2 · Q64
  The $\mathrm{K_{sp}}$ for bismuth sulphide ( $\mathrm{Bi_2S_3}$ ) is $1.08 \times 10^{-73}$ . The solubility of $\mathrm{Bi_2S_3}$ in…
  mediumSingle correctAsked the year before
- 31 Aug ’21 S1 · Q54
  $\mathrm{A_3B_2}$ is a sparingly soluble salt of molar mass M ( $\mathrm{g\,mol^{-1}}$ ) and solubility $x$ g $\mathrm{L^{-1}}$ . The…
  mediumNumerical valueAsked the year before
- 25 Feb ’21 S2 · Q32
  The solubility of $\mathrm{Ca(OH)_2}$ in water is : [Given : The solubility product of $\mathrm{Ca(OH)_2}$ in water $=5.5\times10^{-6}$ ]
  mediumSingle correctAsked the year before
- 9 Jan ’20 S2 · Q27
  The solubility product of $\mathrm{Cr(OH)_3}$ at 298 K is $6.0\times10^{-31}$ . The concentration of hydroxide ions in a saturated solution…
  mediumSingle correctNew idea
OpenRepeated6 · 24%24%4/83
OpenRepeated5 · 20%20%4/82
OpenRepeated2 · 8%8%2/8
OpenRepeated2 · 8%8%2/8
Open1 · 4%4%1/8
Open1 · 4%4%1/8

Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.

Ideas

Every idea inside this topic

7 different ideas were tested; 5 came more than once.

Solubility-Ksp Relationship8×
expression for ratio from solubility in g/l
Single correct · 8 shifts · 3 numerical
Common Ion Effect6×
solubility with common ion
Numerical value · 6 shifts · 4 numerical
Precipitation Condition5×
condition for precipitation on mixing solutions
Single correct · 5 shifts · 2 numerical
General Ksp Formula for AxBy Salts2×
ratio of molar solubilities from ksp
Numerical value · 2 shifts · 1 numerical
Ksp Expression Writing2×
ksp from ion concentrations
Single correct · 2 shifts
Complexation Effect on Solubility1×
ligand needed to lower metal ion concentration
Numerical value · 1 shift · 1 numerical
pH Effect on Solubility1×
solubility of salt of weak acid at given ph
Single correct · 1 shift

Idea	Times	Shifts	Format	Numerical
Solubility-Ksp Relationshipexpression for ratio from solubility in g/l	8	8	Single correctCalculation	3
Common Ion Effectsolubility with common ion	6	6	Numerical valueCalculation	4
Precipitation Conditioncondition for precipitation on mixing solutions	5	5	Single correctCalculation	2
General Ksp Formula for AxBy Saltsratio of molar solubilities from ksp	2	2	Numerical valueCalculation	1
Ksp Expression Writingksp from ion concentrations	2	2	Single correctCalculation	–
Complexation Effect on Solubilityligand needed to lower metal ion concentration	1	1	Numerical valueMulti-step	1
pH Effect on Solubilitysolubility of salt of weak acid at given ph	1	1	Single correctCalculation	–

Times and shifts count every analysed shift. Across JEE Main, 78% of questions since 2024 went back to an idea an earlier year had asked; the rest were new. All repeated ideas

Every question

Solubility Product questions, year by year

The opening words of each question as it appeared in the official paper, with the idea it tested. Open one for its options and the official answer.

Questions from the official JEE Main Paper 1 shifts published by NTA (CBSE for 2017). Questions NTA dropped are left out. Topic and idea tags, counts and notes are Lumi’s.

Key findings

Questions a shift, year by year

Difficulty, format and skill

Difficulty

Format

Skill tested

New idea, or one asked before?

Coverage of the topic

Idea, year, question

Every idea inside this topic

Solubility Product questions, year by year

JEE Main 20262 questions in 2 shifts

JEE Main 20251 question in 1 shift

JEE Main 20244 questions in 4 shifts

JEE Main 20233 questions in 3 shifts

JEE Main 20224 questions in 4 shifts

JEE Main 20217 questions in 7 shifts

JEE Main 20204 questions in 4 shifts

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