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Surface Chemistry — JEE Main & Advanced Chemistry PYQs

195 previous year questions from Surface Chemistry with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

195 questionsChemistrySolutions on every page
1

At a given temperature, 0.45 g of acetic acid in 50 mL of water is shaken with 1.0 g of charcoal and the pH of the resulting solution is 3.0 . Assume, the adsorption of acetic acid

JEE Advanced 2026 Solution View → 2

Adsorption of phenol from its aqueous solution on to fly ash obeys Freundlich isotherm. At a given temperature, from 10 mg g ⁻¹ and 16 mg g ⁻¹ aqueous phenol solutions, the concent

JEE Advanced 2025 Solution View → 3

Consider the following statements related to colloids. (I) Lyophobic colloids are not formed by simple mixing of dispersed phase and dispersion medium. (II) For emulsions, both the

JEE Advanced 2023 Solution View → 4

20 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 ___________.

JEE Main 2023 Solution View → 5

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of colloidal particles in solution should not be mu

JEE Main 2023 Solution View → 6

What happens when a lyophilic sol is added to a lyophobic sol?

JEE Main 2023 Solution View → 7

Four 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 amount of charcoal, the correct order is

JEE Main 2023 Solution View → 8

The number of correct statements about modern adsorption theory of heterogeneous catalysis from the following is ...... A. The catalyst is diffused over the surface of reactants. B

JEE Main 2023 Solution View → 9

Ferric chloride is applied to stop bleeding because

JEE Main 2023 Solution View → 10

The statement/s which are true about antagonists from the following is/are: A. They bind to the receptor site. B. Get transferred inside the cell for their action. C. Inhibit the n

JEE Main 2023 Solution View → 11

Coagulating 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 x times the coagulating power of NaCl . T

JEE Main 2023 Solution View → 12

The water gas on reacting with cobalt as a catalyst forms

JEE Main 2023 Solution View → 13

Which of the following represents the Freundlich adsorption isotherms? (A) (B) (C) (D) Choose the correct answer from the options given below:

JEE Main 2023 Solution View → 14

The number of colloidal systems from the following, which will have 'liquid' as the dispersion medium, is _____. Gem stones, paints, smoke, cheese, milk, hair cream, insect

JEE Main 2023 Solution View → 15

Match 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 2 II Pepsin C Starc

JEE Main 2023 Solution View → 16

In figure, a straight line is given for Freundrich Adsorption ( y = 3 x + 2 . 505 ) . The value of 1 n and logK are respectively.

JEE Main 2023 Solution View → 17

Given 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 Kr ; 1 g of activated charcoal adsorbs m

JEE Main 2023 Solution View → 18

Match 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 ⟶ Fe ( s ) 2 NH 3 g III Chromatogr

JEE Main 2023 Solution View → 19

Adding surfactants in non polar solvent, the micelles structure will look like (a) (b) (c) (d)

JEE Main 2023 Solution View → 20

The 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 . The mass of gas adsorbed per unit ma

JEE Main 2023 Solution View → 21

Match List-I and List-II List-I List-II A. Osmosis I. Solvent molecules pass through semi permeable membrane towards solvent side. B. Reverse osmosis II. Movement of charged colloi

JEE Main 2023 Solution View → 22

Which of the following salt solutions would coagulate the colloid soloution formed when FeCl 3 is added to NaOH solution, at the fastest rate?

JEE Main 2023 Solution View → 23

Based on the given figure, the number of correct statement/s is/are A. Surface tension is the outcome of equal attractive and repulsion forces acting on the liquid molecule in bulk

JEE Main 2023 Solution View → 24

The number of incorrect statement/s from the following is/are A. Water vapours are adsorbed by anhydrous calcium chloride. B. There is a decrease in surface energy during adsorptio

JEE Main 2023 Solution View → 25

The number of statement/s which are the characteristics of physisorption is ___________. A. It is highly specific in nature B. Enthalpy of adsorption is high C. It decreases with i

JEE Main 2023 Solution View → 26

Statement I: For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at same concentration. Statement II: For

JEE Main 2023 Solution View → 27

The correct option(s) related to adsorption processes is(are)

JEE Advanced 2022 Solution View → 28

Given 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 gas showing least adsorption on a definit

JEE Main 2022 Solution View → 29

100 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 well. This resulted in a/ an

JEE Main 2022 Solution View → 30

Among the following the number of curves not in accordance with Freundlich adsorption isotherm is

JEE Main 2022 Solution View → 31

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Dissolved substances can be removed from a colloidal solution by

JEE Main 2022 Solution View → 32

Given 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 colour, as the size of the particles incr

JEE Main 2022 Solution View → 33

Match 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 g + 6 H 2 O g II

JEE Main 2022 Solution View → 34

For micelle formation, which of the following statements are correct? (A) Micelle formation is an exothermic process. (B) Micelle formation is an endothermic process. (C) The entro

JEE Main 2022 Solution View → 35

42 . 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 : Molar mass : Na = 23 . 0 g mol - 1 ; Cl =

JEE Main 2022 Solution View → 36

Which of the following is a correct statement?

JEE Main 2022 Solution View → 37

Match 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) positively charged sol (III) Starch (D) C

JEE Main 2022 Solution View → 38

The Zeta potential is related to which property of colloids?

JEE Main 2022 Solution View → 39

If the initial pressure of a gas is 0 . 03 atm , the mass of the gas adsorbed per gram of the adsorbent is____ × 10 - 2 g

JEE Main 2022 Solution View → 40

Match List - I with List - II. List-I List-II A Lyophilic colloid I Liquid-liquid colloid B Emulsion II Protective colloid C Positively charged colloid III FeCl 3 + NaOH D Negative

JEE Main 2022 Solution View → 41

2 . 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 adsorbent is mL

JEE Main 2022 Solution View → 42

Incorrect statement for Tyndall effect is

JEE Main 2022 Solution View → 43

When 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 . 1   M . The mas

JEE Main 2022 Solution View → 44

Given below are two statements: Statement I : Emulsions of oil in water are unstable and sometimes they separate into two layers on standing. Statement II : For stabilisation of an

JEE Main 2022 Solution View → 45

The correct statement s related to colloids is(are)

JEE Advanced 2021 Solution View → 46

Match List - I with List - II . List- I (Colloid Preparation Method) List- II (Chemical Reaction) ( a ) Hydrolysis ( i ) 2 AuCl 3 + 3 HCHO + 3 H 2 O → 2 Au ( sol ) + 3 HCOOH

JEE Main 2021 Solution View → 47

CH 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 , whereas 15 . 0 mL is adsorbed at 200 mm

JEE Main 2021 Solution View → 48

Select 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 gas adsorbed m - - mass of adsorbent

JEE Main 2021 Solution View → 49

Lyophilic sols are more stable than lyophobic sols because:

JEE Main 2021 Solution View → 50

Tyndall effect is more effectively shown by:

JEE Main 2021 Solution View → 51

The sol given below with negatively charged colloidal particles is:

JEE Main 2021 Solution View → 52

Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface?

JEE Main 2021 Solution View → 53

Given 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 to a large extent than H 2 ( g ) on acti

JEE Main 2021 Solution View → 54

CO 2 gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of CO 2 adsorbed becomes 64 times when the pressure of CO 2 is doubl

JEE Main 2021 Solution View → 55

Match List I with List II : List-I List-II Example of colloids Classification (a) Cheese (i) dispersion of liquid in liquid (b) Pumice stone (ii) dispersion of liquid in gas (c) Ha

JEE Main 2021 Solution View → 56

When silver nitrate solution is added to potassium iodide solution then the sol produced is:

JEE Main 2021 Solution View → 57

For coagulation of 50 mL of a sol, 10 mL of 0.5M Cl - ion solution is required. What is the coagulating value of Cl - ion solution (Nearest integer) NOTE: NTA question has been cha

JEE Main 2021 Solution View → 58

The conditions given below are in the context of observing Tyndall effect in colloidal solutions: (A) The diameter of the colloidal particles is comparable to the wavelength of lig

JEE Main 2021 Solution View → 59

The charges on the colloidal CdS sol and TiO 2 sol are, respectively :

JEE Main 2021 Solution View → 60

For the coagulation of a negative sol, the species below, that has the highest flocculating power is:

JEE Main 2021 Solution View → 61

A colloidal system consisting of a gas dispersed in a solid is called a/an:

JEE Main 2021 Solution View → 62

The INCORRECT statements below regarding colloidal solutions is :

JEE Main 2021 Solution View → 63

The nature of charge on resulting colloidal particles when FeCl 3 is added to excess of hot water is:

JEE Main 2021 Solution View → 64

3 . 12   g of oxygen is adsorbed on 1 . 2   g of platinum metal. The volume of oxygen adsorbed per gram of the adsorbent at 1   atm and 300   K in L is R = 0 .

JEE Main 2021 Solution View → 65

Which one of the following statements is FALSE for hydrophilic sols?

JEE Main 2021 Solution View → 66

In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption x m is directly proportional to P x . The value of x is :

JEE Main 2021 Solution View → 67

Most suitable salt which can be used for efficient clotting of blood will be?

JEE Main 2021 Solution View → 68

In Freundlich adsorption isotherm, slope of AB line is:

JEE Main 2021 Solution View → 69

For Freundlich adsorption isotherm, a plot of log x / m y - axis and log p x - axis gives a straight line, the intercept and slope fo rthe line is 0 . 4771 and 2 , respectively. Th

JEE Main 2020 Solution View → 70

Kraft temperature is the temperature:

JEE Main 2020 Solution View → 71

Adsorption of a gas follows Freudlich adsorption isotherm. If x is the mass of the gas adsorbed on mass m of the adsorbent, the correct plot of x m versus p is:

JEE Main 2020 Solution View → 72

Identify the correct molecular picture showing what happens at the critical micellar concentration ( CMC ) of an aqueous solution of a surfactant

JEE Main 2020 Solution View → 73

A sample of red ink (a colloidal suspension) is prepared by mixing eosine dye, egg white, HCHO and water. The component which ensures stability of the ink sample is :

JEE Main 2020 Solution View → 74

Match the following: (i) Foam (a) smoke (ii) Gel (b) cell fluid (iii) Aerosol (c) jellies (iv) Emulsion (d) rubber (e) froth (f) milk

JEE Main 2020 Solution View → 75

Tyndall effect is observed when :

JEE Main 2020 Solution View → 76

Amongst the following statements regarding adsorption, those that are valid are: (a) Δ H becomes less negative as adsorption proceeds. (b) On a given adsorbent, ammonia is ads

JEE Main 2020 Solution View → 77

Which of the following is used for the preparation of colloids ?

JEE Main 2020 Solution View → 78

The mass of gas adsorbed, x , per unit mass of adsorbate, m , was measured at various pressures, p . A graph between log x m and log p gives a straight line with slope equal to 2 a

JEE Main 2020 Solution View → 79

As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order:

JEE Main 2020 Solution View → 80

The flocculation value of H C l for arsenic sulphide s o l is 30 m m o l L - 1 . If H 2 S O 4 is used for the flocculation of arsenic sulphide, the amount, in grams, of H 2 S O 4 i

JEE Main 2020 Solution View → 81

The critical micelle concentration CMC of a cationic colloidal electrolyte is 10 - 3 M . If 1 mm 3 contains 10 13 micelles, the number of cations making one micelle is (Given, N A

NTA Abhyas JEE Main 2020 Solution View → 82

The coagulation of 10 cm 3 of Gold sol by 1 ml 10% NaCl solution is completely prevented by addition of 0.25 g of starch to it. The gold number of starch is-

NTA Abhyas JEE Main 2020 Solution View → 83

Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure (P). if x m ∝ P ( 1 / y ) fi

NTA Abhyas JEE Main 2020 Solution View → 84

The gold numbers of a few protective colloids are (A) Starch = 25 (B) Gelatin = 0.005 - 0.01 (C) Hemoglobin = 0.03 (D) ​Dextrin = 6 - 123. Which is the best protective colloid ?

NTA Abhyas JEE Main 2020 Solution View → 85

A catalyst adsorb 100 mL of nitrogen gas at S.T.P. per gram of catalyst surface and forms a mono-molecular layer. The effective surface area occupied by one nitrogen molecule on th

NTA Abhyas JEE Main 2020 Solution View → 86

Bleeding is stopped by the application of ferric chloride. This is because:

NTA Abhyas JEE Main 2020 Solution View → 87

Which of the following is less than zero during adsorption?

NTA Abhyas JEE Main 2020 Solution View → 88

A s 2 S 3 and T i O 2 sol are examples of

NTA Abhyas JEE Main 2020 Solution View → 89

Which of the following sols is negatively charged?

NTA Abhyas JEE Main 2020 Solution View → 90

Graph between log ⁡ x m v s log ⁡ P is provided for adsorption of N H 3 gas on metal surface. Calculate weight of N H 3 gas (in gm) absorbed by 24 g of metal surface at 2 atm press

NTA Abhyas JEE Main 2020 Solution View → 91

Among the following, the surface that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is:

NTA Abhyas JEE Main 2020 Solution View → 92

Which of the following statements is correct for a lyophilic sol?

NTA Abhyas JEE Main 2020 Solution View → 93

100 mL of 0 .3 M acetic acid is shaken with 0 .8 g wood charcoal. The final concentration of acetic acid in the solution after adsorption is 0 .125 M . The mass of acetic acid adso

NTA Abhyas JEE Main 2020 Solution View → 94

Adsorption of gases on solid surface is generally exothermic because

NTA Abhyas JEE Main 2020 Solution View → 95

For coagulation of Arsenious sulphide sol, which one of the following salt solution will be most effective

NTA Abhyas JEE Main 2020 Solution View → 96

5 ml of A s 2 S 3 is mixed with distilled waterand 0 .01 M solution of an electrolyte AB so that total volume is 10 ml . it was found that all solution containing more than 5 ml of

NTA Abhyas JEE Main 2020 Solution View → 97

The coagulation values in millimoles per litre of the electrolytes used for coagulation of A s 2 S 2 are given below. I. N a C l = 52 II. B a C l 2 = 0.69 III. M g S O 4 = 0.22 The

NTA Abhyas JEE Main 2020 Solution View → 98

Which of the following statements about physical adsorption is not correct?

NTA Abhyas JEE Main 2020 Solution View → 99

The plots of the extent of adsorption (x/m) Vs pressure at different temperature are as follows; The correct order of increasing temp for curves I, II, III, IV are ;

NTA Abhyas JEE Main 2020 Solution View → 100

Which of the following is not an example of heterogeneous catalysis?

NTA Abhyas JEE Main 2020 Solution View → 101

In the Freundlich adsorption isotherm, the value of 1 n is between 0 and -----.

NTA Abhyas JEE Main 2020 Solution View → 102

10 mL of 1 mM surfactant solution forms a monolayer covering 0 . 24 c m 2 on a polar substrate. If the polar head is approximated as cube, what is its edge length?

NTA Abhyas JEE Main 2020 Solution View → 103

Rate of reaction (r) is plotted against temperature (T) for an enzyme catalysed reaction. Which of the following is correct representation?

NTA Abhyas JEE Main 2020 Solution View → 104

The correct option among the following is

NTA Abhyas JEE Main 2020 Solution View → 105

Which of the following electrolytes will have maximum coagulating value for A g I A g + sol?

NTA Abhyas JEE Main 2020 Solution View → 106

A graph is plotted between log (x/m) and log P according to the equation x m = k P 1 n . Which of the following statements about this graph is not correct?

NTA Abhyas JEE Main 2020 Solution View → 107

Which of the plots is adsorption isobar for chemisorption?

NTA Abhyas JEE Main 2020 Solution View → 108

Plot of log x/m against log p is a straight line inclined at an angle of 45 ° . When the pressure is 0.5 atm and Freundlich parameter, k is 10, the amount of soluble adsorbed per g

NTA Abhyas JEE Main 2020 Solution View → 109

Colloidal sulphur is obtained when

NTA Abhyas JEE Main 2020 Solution View → 110

The best electrolyte for coagulating A s 2 S 3 sol is

NTA Abhyas JEE Main 2020 Solution View → 111

The degree of adsorption of solution on solid surface depends on concentration of solution x m = K C 1 n In which of the conditions, we get following type of graph?

NTA Abhyas JEE Main 2020 Solution View → 112

Among the following surfactant molecules, the surfactant that forms micelles in aqueous solution at the lower CMC at ambient condition is

NTA Abhyas JEE Main 2020 Solution View → 113

Which of the following option is correct for given curve?

NTA Abhyas JEE Main 2020 Solution View → 114

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is NOT correct?

NTA Abhyas JEE Main 2020 Solution View → 115

Which one is not correct according to Langmuir adsorption isotherm at very high pressure?

NTA Abhyas JEE Main 2020 Solution View → 116

Graph between log ⁡ x m and log P is straight line at angle of 45 ° with the intercept of 0.6020. The extent of adsorption x m at a pressure of 1 atm is

NTA Abhyas JEE Main 2020 Solution View → 117

How physical adsorption will be effected by increase in temperature

NTA Abhyas JEE Main 2020 Solution View → 118

The qualitative sketches I, II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of KCl, C H 3 O H and C H 3 C

NTA Abhyas JEE Main 2020 Solution View → 119

For adsorption of a gas on a solid, the plot of log ⁡ x m vs log P is linear with slope equal to (n being whole number)

NTA Abhyas JEE Main 2020 Solution View → 120

Select the correct adsorption isobars for chemisorptions and physisorption respectively (Here, x m degree of adsorption)

NTA Abhyas JEE Main 2020 Solution View →
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