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Friday, 9 October

JEE Main Chemistry · Class 12

Solutions: JEE Main previous year questions

Solutions had 53 questions in the 42 JEE Main shifts Lumi analysed, about 1.1 a shift, asked in 39 of 42 shifts. It ranks 8 of 30 Chemistry chapters by questions; 8% of its questions were hard.

Questions
53
in 39 of 42 shifts
A shift, on average
1.1
of 25 Chemistry questions
Since 2024
+0.4
0.9 a shift in 2017–23, 1.3 in 2024–26
Numerical answer
23
43% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
07141’174’204’214’226’2310’2413’2511’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20171
  • 20204
  • 20214
  • 20224
  • 20236
  • 202410
  • 202513
  • 202611
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

5 topics and 21 distinct ideas; 14 ideas were asked more than once. Most questions are numerical value and calculation.

Topics, by questions

7 questions had no close topic in our taxonomy and are counted for the chapter only.

Ideas asked most
14 repeat

Study it on Lumi

Solutions: the interactive lesson

Every question

All 53 Solutions questions

Newest first. Each opens with its options and the official answer.

2026 11 questions

  1. 2 Apr 2026, Shift 1 · Q5519.519.5 g of fluoro acetic acid (molar mass =78 g mol−1=78\ \mathrm{g\ mol^{-1}}) is dissolved in 500500 g of water at 298298 K. The depression in the…MediumSingle correct
  2. 2 Apr 2026, Shift 2 · Q55Solution A is prepared by dissolving 1 g of a protein (molar mass = 50000 g mol−1^{-1}) in 0.5 L of water at 300 K. Its osmotic pressure…EasySingle correct
  3. 4 Apr 2026, Shift 1 · Q75A non-volatile, non-electrolyte solid solute when dissolved in 4040 g of a solvent, the vapour pressure of the solvent decreased from…MediumNumerical value
  4. 4 Apr 2026, Shift 2 · Q54At 27 ∘^\circC, 0.1 M, 1 L K4[Fe(CN)6]\mathrm{K_4[Fe(CN)_6]} aqueous solution and 0.1 M, 1 L FeCl3\mathrm{FeCl_3} aqueous solution are placed in a…MediumSingle correctHas a figure
  5. 5 Apr 2026, Shift 1 · Q54What is the mole fraction of water in 10% by weight (w/w) of aqueous urea solution? [Given: Molar mass of H, O, C and N are 1, 16, 12 and…EasySingle correct
  6. 5 Apr 2026, Shift 2 · Q7320 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…MediumNumerical value
  7. 6 Apr 2026, Shift 1 · Q56When 0.25 moles of a non-volatile, non-ionizable solute was dissolved in 1 mole of a solvent the vapor pressure of solution was xx % of…EasySingle correct
  8. 6 Apr 2026, Shift 2 · Q55Given below are two statements : Statement I : H2O\mathrm{H_2O} molecules move from the chamber 1 to chamber 2. Statement II : The osmotic…MediumTwo statementsHas a figure
  9. 6 Apr 2026, Shift 2 · Q56Given is a concentrated solution of a weak electrolyte AxBy\mathrm{A_xB_y} of concentration 'c' and dissociation constant 'K'. The degree of…HardSingle correct
  10. 8 Apr 2026, Shift 2 · Q52Given below are two statements : Given : Molar mass of C, H, O, Cl are 12, 1, 16 and 35.5 g mol−1^{-1}, respectively Statement I : In 30%…MediumTwo statements
  11. 8 Apr 2026, Shift 2 · Q54Which of the following statements are not correct ? A. For water, magnitude of Kb\mathrm{K_b} is more than the magnitude of…MediumOtherHas a figure

2025 13 questions

  1. 2 Apr 2025, Shift 1 · Q54Which of the following graph correctly represents the plots of KH\mathrm{K_H} at 1 bar for gases in water versus temperature?HardDiagram basedHas a figure
  2. 2 Apr 2025, Shift 1 · Q55A 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…MediumSingle correct
  3. 2 Apr 2025, Shift 2 · Q51'xx' g of NaCl is added to water in a beaker with a lid. The temperature of the system is raised from 1∘1^\circC to 25∘25^\circC. Which…HardDiagram basedHas a figure
  4. 2 Apr 2025, Shift 2 · Q73When 1 g each of compounds AB and AB2\mathrm{AB_2} are dissolved in 15 g of water separately, they increased the boiling point of water by…MediumNumerical value
  5. 3 Apr 2025, Shift 1 · Q542 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is: (Given :…EasySingle correct
  6. 4 Apr 2025, Shift 2 · Q53Given below are two statements : Statement (I) : Molal depression constant KfK_f is given by M1RTfΔSfus\frac{M_1RT_f}{\Delta S_{fus}}, where…MediumTwo statements
  7. 4 Apr 2025, Shift 2 · Q73Sea water, which can be considered as a 6 molar (6 M) solution of NaCl, has a density of 2 g mL−12\ \mathrm{g\,mL^{-1}}. The concentration of…MediumNumerical value
  8. 7 Apr 2025, Shift 1 · Q72The percentage dissociation of a salt (MX3\mathrm{MX_3}) solution at given temperature (van't Hoff factor i=2i = 2) is ___________ %(Nearest…EasyNumerical value
  9. 7 Apr 2025, Shift 2 · Q53The hydration energies of K+\mathrm{K^+} and Cl−\mathrm{Cl^-} are −x-x and −y-y kJ/mol respectively. If lattice energy of KCl is −z-z…EasySingle correct
  10. 7 Apr 2025, Shift 2 · Q54Match List - I with List - II. List - I | List - II (A) Solution of chloroform and acetone | (I) Minimum boiling azeotrope (B) Solution of…MediumMatch the list
  11. 7 Apr 2025, Shift 2 · Q55Liquid 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…MediumSingle correct
  12. 8 Apr 2025, Shift 2 · Q52Which of the following binary mixture does not show the behaviour of minimum boiling azeotropes?MediumSingle correct
  13. 8 Apr 2025, Shift 2 · Q53HA(aq)⇌H+(aq)+A−(aq)\mathrm{HA(aq) \rightleftharpoons H^+(aq) + A^-(aq)} The freezing point depression of a 0.1 m aqueous solution of a monobasic weak acid…MediumSingle correct

2024 10 questions

  1. 6 Apr 2024, Shift 2 · Q61Molality (mm) of 3 M aqueous solution of NaCl is : (Given : Density of solution =1.25 g mL−1=1.25\ \mathrm{g\,mL^{-1}}, Molar mass in…EasySingle correct
  2. 6 Apr 2024, Shift 2 · Q84When 'xx' ×10−2\times 10^{-2} mL methanol (molar mass =32= 32 g; density =0.792= 0.792 g/cm3^3) is added to 100 mL water (density =1= 1…MediumNumerical valueHas a figure
  3. 8 Apr 2024, Shift 1 · Q84A solution containing 10 g of an electrolyte AB2\mathrm{AB_2} in 100 g of water boils at 100.52∘100.52^\circC. The degree of ionization of the…MediumNumerical value
  4. 9 Apr 2024, Shift 1 · Q630.05M CuSO40.05\mathrm{M}\ \mathrm{CuSO_4} when treated with 0.01M K2Cr2O70.01\mathrm{M}\ \mathrm{K_2Cr_2O_7} gives green colour solution of…MediumSingle correctHas a figure
  5. 9 Apr 2024, Shift 1 · Q81Molarity (M) of an aqueous solution containing xx g of anhyd. CuSO4\mathrm{CuSO_4} in 500 mL solution at 32 ∘^\circC is 2×10−12\times10^{-1} M.…MediumNumerical value
  6. 9 Apr 2024, Shift 2 · Q84The vapor pressure of pure benzene and methyl benzene at 27∘27^\circC is given as 80 Torr and 24 Torr, respectively. The mole fraction of…MediumNumerical value
  7. 29 Jan 2024, Shift 1 · Q84The osmotic pressure of a dilute solution is 7×1057\times10^{5} Pa at 273K. Osmotic pressure of the same solution at 283K is ________…EasyNumerical value
  8. 30 Jan 2024, Shift 2 · Q61If a substance 'A' dissolves in solution of a mixture of 'B' and 'C' with their respective number of moles as nA\mathrm{n_A},…EasySingle correct
  9. 30 Jan 2024, Shift 2 · Q64The solution from the following with highest depression in freezing point/lowest freezing point isMediumSingle correct
  10. 31 Jan 2024, Shift 1 · Q62Identify the mixture that shows positive deviations from Raoult's LawMediumSingle correct

2023 6 questions

  1. 6 Apr 2023, Shift 1 · Q85Mass of Urea (NH2CONH2\mathrm{NH_2CONH_2}) required to be dissolved in 1000 g of water in order to reduce the vapour pressure of water by 25% is…MediumNumerical value
  2. 8 Apr 2023, Shift 2 · Q84If 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…MediumNumerical value
  3. 11 Apr 2023, Shift 1 · Q81A solution of sugar is obtained by mixing 200g of its 25% solution and 500g of its 40% solution (both by mass). The mass percentage of the…EasyNumerical value
  4. 11 Apr 2023, Shift 1 · Q840.004 M K2SO4\mathrm{K_2SO_4} solution is isotonic with 0.01 M glucose solution. Percentage dissociation of K2SO4\mathrm{K_2SO_4} is…MediumNumerical value
  5. 13 Apr 2023, Shift 2 · Q63Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of…MediumAssertion–reason
  6. 13 Apr 2023, Shift 2 · Q84Sea water contains 29.25% NaCl and 19% MgCl2\mathrm{MgCl_2} by weight of solution. The normal boiling point of the sea water is ______…MediumNumerical value

2022 4 questions

  1. 25 Jul 2022, Shift 1 · Q63The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L−10.5\ \mathrm{mL\,L^{-1}} is 0.0405∘0.0405^\circC.…MediumSingle correct
  2. 28 Jul 2022, Shift 1 · Q84150 g of acetic acid was contaminated with 10.2 g ascorbic acid (C6H8O6\mathrm{C_6H_8O_6}) to lower down its freezing point by…EasyNumerical value
  3. 24 Jun 2022, Shift 1 · Q83The osmotic pressure of blood is 7.47 bar at 300 K. To inject glucose to a patient intravenously, it has to be isotonic with blood. The…EasyNumerical value
  4. 29 Jun 2022, Shift 1 · Q831.2 mL of acetic acid is dissolved in water to make 2.0 L of solution. The depression in freezing point observed for this strength of acid…MediumNumerical value

2021 4 questions

  1. 3 Aug 2021, Shift 2 · Q32The lowest freezing point among the following solutions will be observed in [Atomic weight : C = 12, Mg = 24, Na = 23, Cl = 35.5, O = 16,…EasySingle correct
  2. 25 Jul 2021, Shift 1 · Q56CO2\mathrm{CO_2} gas is bubbled through water during a soft drink manufacturing process at 298 K. If CO2\mathrm{CO_2} exerts a partial…MediumNumerical value
  3. 16 Mar 2021, Shift 2 · Q55At 363 K, the vapour pressure of A is 21 kPa and that of B is 18 kPa. One mole of A and 2 moles of B are mixed. Assuming that this…EasyNumerical value
  4. 18 Mar 2021, Shift 1 · Q542 molal solution of a weak acid HA has a freezing point of 3.885°C. The degree of dissociation of this acid is __________ ×10−3\times10^{-3}.…MediumNumerical value

2020 4 questions

  1. 9 Jan 2020, Shift 2 · Q46A cylinder containing an ideal gas (0.1 mol of 1.0 dm3^3) is in thermal equilibrium with a large volume of 0.5 molal aqueous solution of…HardNumerical valueHas a figure
  2. 9 Jan 2020, Shift 2 · Q4710.30 mg of O2\mathrm{O_2} is dissolved into a liter of sea water of density 1.03 g/mL. The concentration of O2\mathrm{O_2} in ppm is…EasyNumerical value
  3. 2 Sep 2020, Shift 1 · Q26An open beaker of water in equilibrium with water vapour is in a sealed container. When a few grams of glucose are added to the beaker of…MediumSingle correct
  4. 6 Sep 2020, Shift 2 · Q43A set of solutions is prepared using 180 g of water as a solvent and 10 g of different non-volatile solutes A, B and C. The relative…EasySingle correct

2017 1 questions

  1. 2 Apr 2017 (offline) · Q37The freezing point of benzene decreases by 0.45°C when 0.2 g of acetic acid is added to 20 g of benzene. If acetic acid associates to form…MediumSingle correct

Pattern: Asked most years.