JEE Main · Chemistry · Solutions
Colligative Properties: JEE Main previous year questions
89 questions in the 108 JEE Main shifts Lumi analysed, in 8 of 8 years. Pattern: Asked most years. 29 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 89
- in 89 of 108 shifts
- Years asked
- 8/8
- last asked 2026
- Weighted estimate
- 0.8
- model; history: 0.8 a shift on average, typically 0.6–0.9
Key findings
- 01
Asked in 8 of 8 years with analysed shifts and in 89 of 108 shifts: 89 questions, #10 of 196 topics. It came in every year with analysed shifts.
- 02
32% of its questions since 2020 tested an idea no earlier year had asked; 47 repeated an idea from the year before.
- 03
The most repeated idea is Freezing Point Depression, asked 16 times in 16 shifts (2020, 2021, 2022, 2024), most often as “freezing point of solution”.
- 04
JEE Main has asked 21 of the 46 ideas in this topic; 19 have never been asked, directly or inside another question.
- 05
Mostly asked as numerical value (70%); 70% need a numerical answer, 31% are easy and 7% hard.
- 06
The skill tested most is calculation (66%), then multi-step (16%).
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: 1 in 1 shift · 2020: 8 in 12 shifts · 2021: 21 in 24 shifts · 2022: 18 in 24 shifts · 2023: 12 in 12 shifts · 2024: 14 in 18 shifts · 2025: 7 in 8 shifts · 2026: 8 in 9 shifts.
- Up to 2023
- 0.7
- a shift, of 25
- Since 2024
- 0.8
- 0.1
- Usual gap
- 1.3 yrs
- between years asking it
- Shifts with it
- 89/108
- 82% of analysed shifts
Recent framings
- count correct statements on colligative properties
- numerical: vapour pressure from mole fraction
- statement I/II on osmosis and osmotic pressure
Revise first
- Boiling Point Elevation · asked 2021, 2022, 2023, 2024, 2025, 2026
- Relative Lowering of VP · asked 2020, 2021, 2022, 2023, 2024, 2025, 2026
- Osmotic Pressure · asked 2022, 2023, 2024, 2026
How it is asked
Difficulty, format and skill
Across all 89 questions on Colligative Properties since 2017.
Difficulty
QUESTIONS- Easy28 · 31%
- Medium55 · 62%
- Hard6 · 7%
Format
SHARE- Numerical value · 62 Q70%
- Single correct · 23 Q26%
- Two statements · 2 Q2%
- Other · 2 Q2%
Skill tested
SHARE- Calculation · 59 Q66%
- Multi-step · 14 Q16%
- Application · 7 Q8%
- Conceptual · 7 Q8%
- Data or graph · 2 Q2%
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.
- Idea asked for the first time
- Idea asked in an earlier year
Coverage of the topic
JEE Main has asked 21 of the 46 ideas in this topic. 19 have never been asked yet.
- Asked directly21 · 46%
- Touched inside another question6 · 13%
- Never asked19 · 41%
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
Chapter, idea, question
Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.
20 ideas inside
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
21 different ideas were tested; 13 came more than once.
freezing point of solution
Numerical value · 16 shifts · 12 numericalmolar mass from boiling point elevation
Numerical value · 13 shifts · 10 numericalvapour pressure from mole fraction
Numerical value · 12 shifts · 6 numericalstatement i/ii on osmosis and osmotic pressure
Numerical value · 7 shifts · 6 numericalvan't hoff factor from freezing point depression
Numerical value · 7 shifts · 4 numericalpercentage dissociation from van't hoff factor
Numerical value · 6 shifts · 6 numericalka of weak acid from freezing point depression
Numerical value · 4 shifts · 2 numericalpercentage dissociation from isotonic solutions
Numerical value · 4 shifts · 4 numericalpercentage association from freezing point depression
Numerical value · 4 shifts · 2 numericaltrue statement selection on osmosis
Single correct · 2 shiftsmolar mass from osmotic height
Numerical value · 2 shifts · 2 numericalosmotic pressure of mixed solutions
Numerical value · 2 shifts · 1 numericalmass of antifreeze for given freezing point
Numerical value · 2 shifts · 2 numericalstatement i/ii on cryoscopic constant
Two statements · 1 shiftorder/ranking of freezing point depression
Single correct · 1 shiftread boiling point of solvent from vapour pressure curve
Numerical value · 1 shift · 1 numericalratio of kb from thermodynamic data
Numerical value · 1 shift · 1 numericalmolar mass from freezing point depression
Numerical value · 1 shift · 1 numericalmoles of solute from vapour pressure lowering
Numerical value · 1 shift · 1 numericalelevation in boiling point with dimerisation
Numerical value · 1 shift · 1 numericalgraph interpretation of vapour pressure curves
Other · 1 shift
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| Freezing Point Depressionfreezing point of solution | 16 | 16 | Numerical valueCalculation | 12 | |
| Boiling Point Elevationmolar mass from boiling point elevation | 13 | 13 | Numerical valueCalculation | 10 | |
| Relative Lowering of VPvapour pressure from mole fraction | 12 | 12 | Numerical valueCalculation | 6 | |
| Osmotic Pressurestatement i/ii on osmosis and osmotic pressure | 7 | 7 | Numerical valueCalculation | 6 | |
| Van't Hoff Factor (i)van't hoff factor from freezing point depression | 7 | 7 | Numerical valueCalculation | 4 | |
| Degree of Dissociation from Van't Hoff Factorpercentage dissociation from van't hoff factor | 6 | 6 | Numerical valueCalculation | 6 | |
| Calculating Ka from Freezing Point Depressionka of weak acid from freezing point depression | 4 | 4 | Numerical valueCalculation | 2 | |
| Isotonic Solutionspercentage dissociation from isotonic solutions | 4 | 4 | Numerical valueCalculation | 4 | |
| Degree of Association from Van't Hoff Factorpercentage association from freezing point depression | 4 | 4 | Numerical valueCalculation | 2 | |
| Hypertonic and Hypotonic Solutionstrue statement selection on osmosis | 2 | 2 | Single correctApplication | – | |
| Osmometry for Macromolecule Molar Massmolar mass from osmotic height | 2 | 2 | Numerical valueCalculation | 2 | |
| Osmotic Pressure of Mixed Solutionsosmotic pressure of mixed solutions | 2 | 2 | Numerical valueCalculation | 1 | |
| Antifreeze Mass Calculationsmass of antifreeze for given freezing point | 2 | 2 | Numerical valueCalculation | 2 | |
| Thermodynamic Calculation of Cryoscopic Constantstatement i/ii on cryoscopic constant | 1 | 1 | Two statementsConceptual | – | |
| Ranking Solutions by Colligative Extremesorder/ranking of freezing point depression | 1 | 1 | Single correctApplication | – | |
| Phase Diagram Interpretation: Boiling Pointread boiling point of solvent from vapour pressure curve | 1 | 1 | Numerical valueData or graph | 1 | |
| Thermodynamic Derivation of Ebullioscopic Constant (Kb)ratio of kb from thermodynamic data | 1 | 1 | Numerical valueCalculation | 1 | |
| Molar Mass Determinationmolar mass from freezing point depression | 1 | 1 | Numerical valueCalculation | 1 | |
| RLVP to Molality Approximation Formulamoles of solute from vapour pressure lowering | 1 | 1 | Numerical valueCalculation | 1 | |
| Carboxylic Acid Dimerization in Non-Polar Solventselevation in boiling point with dimerisation | 1 | 1 | Numerical valueMulti-step | 1 | |
| Vapor Pressure-Temperature Graph Interpretationgraph interpretation of vapour pressure curves | 1 | 1 | OtherData or graph | – |
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
Colligative Properties questions, year by year
The newest 40 show their opening words as they appeared in the official paper; older ones name the idea they tested. Open one for its options and the official answer.
JEE Main 20268 questions in 8 shifts
- 2 Apr, Shift 1Q55g of fluoro acetic acid (molar mass ) is dissolved in g of water at K. The depression in the…
Idea: Calculating Ka from Freezing Point Depression
Asked the year beforeMediumSingle correct - 2 Apr, Shift 2Q55Solution A is prepared by dissolving 1 g of a protein (molar mass = 50000 g mol) in 0.5 L of water at 300 K. Its osmotic pressure…
Idea: Osmotic Pressure of Mixed Solutions
EasySingle correct - 4 Apr, Shift 1Q75A non-volatile, non-electrolyte solid solute when dissolved in g of a solvent, the vapour pressure of the solvent decreased from…
Idea: Boiling Point Elevation
Asked the year beforeMediumNumerical value - 4 Apr, Shift 2Q54At 27 C, 0.1 M, 1 L aqueous solution and 0.1 M, 1 L aqueous solution are placed in a…
Idea: Hypertonic and Hypotonic Solutions
MediumSingle correct · figure - 5 Apr, Shift 2Q7320 g hemoglobin in a 1 L aqueous solution (A) at 300 K is separated from pure water by semi permeable membrane. At equilibrium the height…
Idea: Osmometry for Macromolecule Molar Mass
MediumNumerical value - 6 Apr, Shift 1Q56When 0.25 moles of a non-volatile, non-ionizable solute was dissolved in 1 mole of a solvent the vapor pressure of solution was % of…
Idea: Relative Lowering of VP
Asked the year beforeEasySingle correct - 6 Apr, Shift 2Q55Given below are two statements : Statement I : molecules move from the chamber 1 to chamber 2. Statement II : The osmotic…
Idea: Osmotic Pressure
MediumTwo statements · figure - 8 Apr, Shift 2Q54Which of the following statements are not correct ? A. For water, magnitude of is more than the magnitude of…
Idea: Boiling Point Elevation
Asked the year beforeMediumOther · figure
JEE Main 20257 questions in 7 shifts
- 2 Apr, Shift 1Q55A solution is made by mixing one mole of volatile liquid A with 3 moles of volatile liquid B. The vapour pressure of pure A is 200 mm Hg…
Idea: Relative Lowering of VP
Asked the year beforeMediumSingle correct - 2 Apr, Shift 2Q73When 1 g each of compounds AB and are dissolved in 15 g of water separately, they increased the boiling point of water by…
Idea: Boiling Point Elevation
Asked the year beforeMediumNumerical value - 3 Apr, Shift 1Q542 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is: (Given :…
Idea: Boiling Point Elevation
Asked the year beforeEasySingle correct - 4 Apr, Shift 2Q53Given below are two statements : Statement (I) : Molal depression constant is given by , where…
Idea: Thermodynamic Calculation of Cryoscopic Constant
New ideaMediumTwo statements - 7 Apr, Shift 1Q72The percentage dissociation of a salt () solution at given temperature (van't Hoff factor ) is ___________ %(Nearest…
Idea: Degree of Dissociation from Van't Hoff Factor
Asked the year beforeEasyNumerical value - 7 Apr, Shift 2Q55Liquid A and B form an ideal solution. The vapour pressures of pure liquids A and B are 350 and 750 mm Hg respectively at the same…
Idea: Relative Lowering of VP
Asked the year beforeMediumSingle correct - 8 Apr, Shift 2Q53The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid…
Idea: Calculating Ka from Freezing Point Depression
MediumSingle correct
JEE Main 202414 questions in 14 shifts
- 4 Apr, Shift 1Q842.5 g of a non-volatile, non-electrolyte is dissolved in 100 g of water at 25°C. The solution showed a boiling point elevation by 2°C.…
Idea: Boiling Point Elevation
Asked the year beforeMediumNumerical value - 4 Apr, Shift 2Q842.7 kg of each of water and acetic acid are mixed. The freezing point of the solution will be -x °C. Consider the acetic acid does not…
Idea: Freezing Point Depression
MediumNumerical value - 5 Apr, Shift 1Q84An artificial cell is made by encapsulating 0.2 M glucose solution within a semipermeable membrane. The osmotic pressure developed when…
Idea: Osmotic Pressure
Asked the year beforeMediumNumerical value - 5 Apr, Shift 2Q84Considering acetic acid dissociates in water, its dissociation constant is . If 5 mL of acetic acid is dissolved in 1…
Idea: Freezing Point Depression
HardNumerical value - 6 Apr, Shift 1Q84Consider the dissociation of the weak acid HX as given below , Ka…
Idea: Osmotic Pressure
Asked the year beforeMediumNumerical value - 6 Apr, Shift 2Q84When '' mL methanol (molar mass g; density g/cm) is added to 100 mL water (density …
Idea: Freezing Point Depression
MediumNumerical value · figure - 8 Apr, Shift 1Q84A solution containing 10 g of an electrolyte in 100 g of water boils at C. The degree of ionization of the…
Idea: Degree of Dissociation from Van't Hoff Factor
Asked the year beforeMediumNumerical value - 9 Apr, Shift 1Q63when treated with gives green colour solution of…
Idea: Hypertonic and Hypotonic Solutions
New ideaMediumSingle correct · figure - 9 Apr, Shift 2Q84The vapor pressure of pure benzene and methyl benzene at C is given as 80 Torr and 24 Torr, respectively. The mole fraction of…
Idea: Relative Lowering of VP
Asked the year beforeMediumNumerical value - 1 Feb, Shift 1Q64We have three aqueous solutions of NaCl labelled as 'A', 'B' and 'C' with concentration 0.1 M, 0.01 M and 0.001 M, respectively. The value…
Idea: Van't Hoff Factor (i)
Asked the year beforeMediumSingle correct - 1 Feb, Shift 2Q83Mass of ethylene glycol (antifreeze) to be added to 18.6 kg of water to protect the freezing point at is ________ kg…
Idea: Antifreeze Mass Calculations
EasyNumerical value - 29 Jan, Shift 1Q84The osmotic pressure of a dilute solution is Pa at 273K. Osmotic pressure of the same solution at 283K is ________…
Idea: Osmotic Pressure
Asked the year beforeEasyNumerical value - 30 Jan, Shift 1Q63What happens to freezing point of benzene when small quantity of napthalene is added to benzene ?
Idea: Freezing Point Depression
EasySingle correct - 30 Jan, Shift 2Q64The solution from the following with highest depression in freezing point/lowest freezing point is
Idea: Ranking Solutions by Colligative Extremes
New ideaMediumSingle correct
JEE Main 202312 questions in 12 shifts
- 6 Apr, Shift 1Q85Mass of Urea () required to be dissolved in 1000 g of water in order to reduce the vapour pressure of water by 25% is…
Idea: Relative Lowering of VP
Asked the year beforeMediumNumerical value - 6 Apr, Shift 2Q84Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is / are…
Idea: Isotonic Solutions
Asked the year beforeMediumNumerical value - 8 Apr, Shift 1Q85The vapour pressure vs. temperature curve for a solution solvent system is shown below. [graph] The boiling point of the solvent is…
Idea: Phase Diagram Interpretation: Boiling Point
New ideaEasyNumerical value · figure - 8 Apr, Shift 2Q84If the boiling points of two solvents X and Y (having same molecular weights) are in the ratio 2:1 and their enthalpy of vaporizations are…
Idea: Thermodynamic Derivation of Ebullioscopic Constant (Kb)
New ideaMediumNumerical value - 10 Apr, Shift 1Q84If the degree of dissociation of aqueous solution of weak monobasic acid is determined to be 0.3, then the observed freezing point will be…
Idea: Degree of Dissociation from Van't Hoff Factor
Asked the year beforeMediumNumerical value - 10 Apr, Shift 2Q84An aqueous solution of volume 300 contains 0.63 g of protein. The osmotic pressure of the solution at 300 K is 1.29 mbar.…
Idea: Osmotic Pressure
Asked the year beforeMediumNumerical value - 11 Apr, Shift 1Q840.004 M solution is isotonic with 0.01 M glucose solution. Percentage dissociation of is…
Idea: Isotonic Solutions
Asked the year beforeMediumNumerical value - 11 Apr, Shift 2Q62What weight of glucose must be dissolved in 100 g of water to lower the vapour pressure by 0.20 mm Hg ? (Assume dilute solution is being…
Idea: Relative Lowering of VP
Asked the year beforeMediumSingle correct - 12 Apr, Shift 1Q8480 mole percent of is dissociated in aqueous solution. The vapour pressure of 1.0 molal aqueous solution of…
Idea: Van't Hoff Factor (i)
Asked the year beforeMediumNumerical value - 13 Apr, Shift 1Q84Solution of 12 g of non-electrolyte (A) prepared by dissolving it in 1000 mL of water exerts the same osmotic pressure as that of 0.05 M…
Idea: Osmotic Pressure
Asked the year beforeEasyNumerical value - 13 Apr, Shift 2Q84Sea water contains 29.25% NaCl and 19% by weight of solution. The normal boiling point of the sea water is ______…
Idea: Boiling Point Elevation
Asked the year beforeMediumNumerical value - 15 Apr, Shift 1 · Q83Relative Lowering of VPAsked the year beforeMedium
JEE Main 202218 questions in 18 shifts
- 25 Jul, Shift 1 · Q63Van't Hoff Factor (i)Asked the year beforeMedium
- 25 Jul, Shift 2 · Q62Freezing Point DepressionAsked the year beforeEasy
- 26 Jul, Shift 2 · Q84Boiling Point ElevationAsked the year beforeEasy
- 27 Jul, Shift 1 · Q65Boiling Point ElevationAsked the year beforeEasy
- 27 Jul, Shift 2 · Q84RLVP to Molality Approximation FormulaNew ideaMedium
- 28 Jul, Shift 1 · Q84Freezing Point DepressionAsked the year beforeEasy
- 29 Jul, Shift 2 · Q83Molar Mass DeterminationNew ideaMedium
- 30 Jul, Shift 2 · Q53Freezing Point DepressionAsked the year beforeEasy
- 24 Jun, Shift 1 · Q83Isotonic SolutionsEasy
- 25 Jun, Shift 2 · Q63Degree of Association from Van't Hoff FactorAsked the year beforeMedium
- 26 Jun, Shift 1 · Q82Degree of Dissociation from Van't Hoff FactorAsked the year beforeMedium
- 26 Jun, Shift 2 · Q85Osmotic PressureNew ideaMedium
- 27 Jun, Shift 1 · Q83Boiling Point ElevationAsked the year beforeEasy
- 27 Jun, Shift 2 · Q85Boiling Point ElevationAsked the year beforeEasy
- 28 Jun, Shift 1 · Q85Relative Lowering of VPAsked the year beforeMedium
- 28 Jun, Shift 2 · Q83Osmometry for Macromolecule Molar MassNew ideaMedium
- 29 Jun, Shift 1 · Q83Calculating Ka from Freezing Point DepressionAsked the year beforeMedium
- 29 Jun, Shift 2 · Q83Boiling Point ElevationAsked the year beforeEasy
JEE Main 202121 questions in 21 shifts
- 3 Aug, Shift 1 · Q54Antifreeze Mass CalculationsNew ideaMedium
- 3 Aug, Shift 2 · Q32Freezing Point DepressionAsked the year beforeEasy
- 4 Aug, Shift 1 · Q54Boiling Point ElevationNew ideaEasy
- 4 Aug, Shift 2 · Q56Van't Hoff Factor (i)New ideaMedium
- 26 Aug, Shift 1 · Q54Van't Hoff Factor (i)New ideaEasy
- 26 Aug, Shift 2 · Q54Freezing Point DepressionAsked the year beforeMedium
- 27 Aug, Shift 1 · Q53Freezing Point DepressionAsked the year beforeHard
- 27 Aug, Shift 2 · Q56Freezing Point DepressionAsked the year beforeEasy
- 31 Aug, Shift 1 · Q33Van't Hoff Factor (i)New ideaEasy
- 31 Aug, Shift 2 · Q55Carboxylic Acid Dimerization in Non-Polar SolventsNew ideaHard
- 24 Feb, Shift 1 · Q55Calculating Ka from Freezing Point DepressionNew ideaHard
- 24 Feb, Shift 2 · Q54Freezing Point DepressionAsked the year beforeEasy
- 25 Feb, Shift 1 · Q54Van't Hoff Factor (i)New ideaMedium
- 25 Feb, Shift 2 · Q55Degree of Dissociation from Van't Hoff FactorNew ideaMedium
- 26 Feb, Shift 1 · Q54Relative Lowering of VPAsked the year beforeHard
- 26 Feb, Shift 2 · Q55Degree of Association from Van't Hoff FactorMedium
- 22 Jul, Shift 2 · Q32Freezing Point DepressionAsked the year beforeEasy
- 25 Jul, Shift 2 · Q55Boiling Point ElevationNew ideaEasy
- 17 Mar, Shift 2 · Q54Degree of Dissociation from Van't Hoff FactorNew ideaMedium
- 18 Mar, Shift 1 · Q54Freezing Point DepressionAsked the year beforeMedium
- 18 Mar, Shift 2 · Q54Degree of Association from Van't Hoff FactorMedium
JEE Main 20208 questions in 8 shifts
- 8 Jan, Shift 1 · Q31Vapor Pressure-Temperature Graph InterpretationNew ideaMedium
- 9 Jan, Shift 1 · Q47Freezing Point DepressionNew ideaMedium
- 9 Jan, Shift 2 · Q46Freezing Point DepressionNew ideaHard
- 2 Sep, Shift 1 · Q26Relative Lowering of VPNew ideaMedium
- 3 Sep, Shift 2 · Q47Isotonic SolutionsNew ideaMedium
- 4 Sep, Shift 1 · Q47Relative Lowering of VPNew ideaMedium
- 4 Sep, Shift 2 · Q47Osmotic Pressure of Mixed SolutionsNew ideaEasy
- 6 Sep, Shift 2 · Q43Relative Lowering of VPNew ideaEasy
JEE Main 20171 question in 1 shift
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.
More topics in Solutions
This is the only topic tagged in this chapter.