Jump to a section

Chemistry - Surface Chemistry

Practise 123 JEE Main previous year questions on Surface Chemistry, compiled from papers spanning 2002 to 2023. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Main tests.

Surface Chemistry has been asked in 17 of the 25 years of JEE Main papers analysed (2002–2026), with 123 questions in all. 54% of them were easy, 41% moderate and 4% tough. Most of its questions came from 2023, with 23 questions that year. In the last three years (2024–2026) it had 0 questions across 49 papers, about 0 per paper.

The chapter's 7 topics are not weighted equally: Properties of colloidal solution (39 questions, 32%), Adsorption (22 questions, 18%), and Colloids (22 questions, 18%) have been asked the most. Properties of colloidal solution has also led over the last five years, with 14 questions. Properties of colloidal solution has produced the most tough questions (3).

  1. 120 mL of 0 . 5 M NaCl is required to coagulate 200 mL of As 2 S 3 solution in 2 hours. The coagulating value of NaCl is ___________.15 Apr, 2023 (M)Properties of colloidal solution
  2. 2What happens when a lyophilic sol is added to a lyophobic sol?13 Apr, 2023 (M)Colloids
  3. 3Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of colloida13 Apr, 2023 (E)Properties of colloidal solution
  4. 4Four gases, A , B , C and D have critical temperatures 5 . 3 , 33 . 2 , 126 . 0 and 154 . 3 K respectively For their adsorption on a fixed a12 Apr, 2023 (M)Adsorption
  5. 5The number of correct statements about modern adsorption theory of heterogeneous catalysis from the following is ...... A. The catalyst is d11 Apr, 2023 (E)Catalysis and Theories of Catalysis
  6. 6Ferric chloride is applied to stop bleeding because10 Apr, 2023 (E)Properties of colloidal solution
  7. 7The water gas on reacting with cobalt as a catalyst forms08 Apr, 2023 (M)Catalysis and Theories of Catalysis
  8. 8Which of the following represents the Freundlich adsorption isotherms? (A) (B) (C) (D) Choose the correct answer from the options given belo08 Apr, 2023 (M)Adsorption isotherms
  9. 9The statement/s which are true about antagonists from the following is/are: A. They bind to the receptor site. B. Get transferred inside the08 Apr, 2023 (E)Catalysis and Theories of Catalysis
  10. 10Coagulating value of the electrolytes AlCl 3 and NaCl tor As 2 S 3 are 0 . 09 and 50 . 04 respectively. The coagulating power of AlCl 3 is x08 Apr, 2023 (E)Properties of colloidal solution
  11. 11Match List I with List II LIST I Enzymatic reaction LIST II - Enzyme A Sucrose Glucose and Fructose I Zymase B Glucose ethyl alcohol and CO 06 Apr, 2023 (M)Catalysis and Theories of Catalysis
  12. 12The number of colloidal systems from the following, which will have liquid as the dispersion medium, is _____. Gem stones, paints, smoke, ch06 Apr, 2023 (E)Colloids
  13. 13Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Amongst He , Ne , Ar and 01 Feb, 2023 (M)Adsorption
  14. 14In figure, a straight line is given for Freundrich Adsorption ( y = 3 x + 2 . 505 ) . The value of 1 n and logK are respectively.01 Feb, 2023 (E)Adsorption isotherms
  15. 15Adding surfactants in non polar solvent, the micelles structure will look like (a) (b) (c) (d)31 Jan, 2023 (M)Properties of colloidal solution
  16. 16Match List I with List II List I List II A Physisorption I Single Layer Adsorption B Chemisorption II 20 - 40 kJ mol - 1 C N 2 g + 3 H 2 g F31 Jan, 2023 (E)Adsorption
  17. 17The graph of log x m vs log p for an adsorption process is a straight line inclined at an angle of 45 with intercept equal to 0 . 6020 . The30 Jan, 2023 (E)Adsorption isotherms
  18. 18Which of the following salt solutions would coagulate the colloid soloution formed when FeCl 3 is added to NaOH solution, at the fastest rat29 Jan, 2023 (M)Colloids
  19. 19Match List-I and List-II List-I List-II A. Osmosis I. Solvent molecules pass through semi permeable membrane towards solvent side. B. Revers29 Jan, 2023 (E)Properties of colloidal solution
  20. 20Based on the given figure, the number of correct statement/s is/are A. Surface tension is the outcome of equal attractive and repulsion forc25 Jan, 2023 (E)Properties of colloidal solution
  21. 21The number of incorrect statement/s from the following is/are A. Water vapours are adsorbed by anhydrous calcium chloride. B. There is a dec25 Jan, 2023 (E)Adsorption
  22. 22Statement I: For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions 24 Jan, 2023 (M)Colloids
  23. 23The number of statement/s which are the characteristics of physisorption is ___________. A. It is highly specific in nature B. Enthalpy of a24 Jan, 2023 (E)Adsorption
  24. 24100 mL of 5 % w / v solution of NaCl in water was prepared in 250 mL beaker. Albumin from the egg was poured into NaCl solution and stirred 29 Jul, 2022 (M)Emulsions and Gels
  25. 25Given below are the critical temperatures of some of the gases: Gas Critical temperature K He 5 . 2 CH 4 190 CO 2 304 . 2 NH 3 405 . 5 The g29 Jul, 2022 (E)Adsorption
  26. 26Among the following the number of curves not in accordance with Freundlich adsorption isotherm is28 Jul, 2022 (E)Adsorption isotherms
  27. 27Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Dissolved substances can 27 Jul, 2022 (E)Properties of colloidal solution
  28. 28Match List - I with List - II. List I (Processes/Reactions) List-II (Catalyst) A 2 SO 2 g + O 2 g 2 SO 3 g I Fe s B 4 NH 3 g + 5 O 2 g 4 NO 26 Jul, 2022 (M)Catalysis and Theories of Catalysis
  29. 29Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Finest gold is red in c26 Jul, 2022 (E)Properties of colloidal solution
  30. 30For micelle formation, which of the following statements are correct? (A) Micelle formation is an exothermic process. (B) Micelle formation 25 Jul, 2022 (E)Preparation and Purification of colloids
  31. 31Which of the following is a correct statement?29 Jun, 2022 (M)Properties of colloidal solution
  32. 3242 . 12 % (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol is [Given : Mo29 Jun, 2022 (E)Properties of colloidal solution
  33. 33The Zeta potential is related to which property of colloids?28 Jun, 2022 (M)Properties of colloidal solution
  34. 34Match List-I with List-II List-I List-II (A) negatively charged sol (I) Fe 2 O 3 xH 2 O (B) macromolecular colloid (II) CdS sol (C) positive28 Jun, 2022 (E)Properties of colloidal solution
  35. 35Match List - I with List - II. List-I List-II A Lyophilic colloid I Liquid-liquid colloid B Emulsion II Protective colloid C Positively char27 Jun, 2022 (M)Colloids
  36. 36If the initial pressure of a gas is 0 . 03 atm , the mass of the gas adsorbed per gram of the adsorbent is____ 10 - 2 g27 Jun, 2022 (E)Adsorption isotherms
  37. 372 . 0 g of H 2 gas is adsorbed on 2 . 5 g of platinum powder at 300 K and 1 bar pressure. The volume of the gas adsorbed per gram of the ads26 Jun, 2022 (M)Adsorption
  38. 38Incorrect statement for Tyndall effect is25 Jun, 2022 (M)Properties of colloidal solution
  39. 39Given below are two statements: Statement I : Emulsions of oil in water are unstable and sometimes they separate into two layers on standing24 Jun, 2022 (M)Emulsions and Gels
  40. 40When 200 mL of 0 . 2 M acetic acid is shaken with 0 . 6 g of wood charcoal, the final concentration of acetic acid after adsorption is 0 . 124 Jun, 2022 (E)Adsorption
  41. 41Match List - I with List - II . List- I (Colloid Preparation Method) List- II (Chemical Reaction) ( a ) Hydrolysis ( i ) 2 AuCl 3 + 3 HCHO +01 Sep, 2021 (E)Preparation and Purification of colloids
  42. 42Select the graph that correctly describes the adsorption isotherms at two temperatures T 1 and T 2 T 1 T 2 for a gas : ( x - mass of the gas31 Aug, 2021 (M)Adsorption isotherms
  43. 43CH 4 is adsorbed on 1 g charcoal at 0 C following the Freundlich adsorption isotherm. 10 . 0 mL of CH 4 is adsorbed at 100 mm of Hg , wherea31 Aug, 2021 (E)Adsorption isotherms
  44. 44Tyndall effect is more effectively shown by:27 Aug, 2021 (M)Properties of colloidal solution
  45. 45Lyophilic sols are more stable than lyophobic sols because:27 Aug, 2021 (E)Colloids
  46. 46Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface?26 Aug, 2021 (M)Adsorption
  47. 47The sol given below with negatively charged colloidal particles is:26 Aug, 2021 (E)Properties of colloidal solution
  48. 48CO 2 gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of CO 2 adsorbed becomes 64 27 Jul, 2021 (M)Adsorption isotherms
  49. 49Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : SO 2 ( g ) is adsorbed 27 Jul, 2021 (E)Adsorption
  50. 50Match List I with List II : List-I List-II Example of colloids Classification (a) Cheese (i) dispersion of liquid in liquid (b) Pumice stone25 Jul, 2021 (E)Colloids

Frequently Asked Questions

1.How many questions are available for Surface Chemistry?

This chapter includes 123 questions compiled from JEE Main papers spanning 2002 to 2023.

2.Are these questions only from JEE Main, or from other exams too?

These are JEE Main questions specifically for the Surface Chemistry chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is Surface Chemistry an important chapter for JEE Main Chemistry?

Surface Chemistry has appeared in 17 of the 25 years of JEE Main papers covered here, with 123 questions across 113 papers - about one per paper it appears in.

4.What is the difficulty level of Surface Chemistry questions in JEE Main?

Of the 123 questions analysed for this chapter, 54% are easy, 41% moderate and 4% tough. 2023 had the most, with 23 questions.

5.Which topics in Surface Chemistry should I focus on?

These topics have carried the most weightage in Surface Chemistry:

  • Properties of colloidal solution - 39 questions (32%)
  • Adsorption - 22 questions (18%)
  • Colloids - 22 questions (18%)
  • Properties of colloidal solution has produced the most tough questions (3).
6.Is Surface Chemistry's weightage in JEE Main going up or down?

Across all 113 papers analysed, Surface Chemistry has averaged about 1.1 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.