Core Syllabus Module

Surface Chemistry

Systematic mastery engine. Select a core micro-topic target below or simulate custom examination constraints.

Exam Simulator

Custom Chapter Mock Test

Generate random timed arrays filtered strictly by Surface Chemistry weightage mappings.

Launch Simulator

Micro-Topic Strategy Matrix

Chapter Elite-20 Challenge Zone

Target Advanced

JEE Advanced 2026

LEVELJEE Advanced

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 from the aqueous solution by charcoal follows Freundlich isotherm, $\frac{x}{m} = k C^{1/ n}$ If the plot of $lo g_{10} (x / m)$ against $lo g_{10} C$ gives a straight line with slope 1, the value of k in $L mol^{- 1}$ is ____. Given: The molar mass of acetic acid is $60 g mol^{- 1}$ . The acid dissociation constant of acetic acid is $1.0 \times 1 0^{- 5}$ at the given temperature. $x$ is the mass (in grams) of acetic acid adsorbed. $m$ is the mass (in grams) of charcoal $C$ is the equilibrium concentration of acetic acid in the solution after the adsorption is complete. $k$ and $n$ are constants for acetic acid-charcoal system at the given temperature.

JEE Advanced 2025

LEVELJEE Advanced

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 concentrations of adsorbed phenol are measured to be $4 mg g^{- 1}$ and $10 mg g^{- 1}$ , respectively. At this temperature, the concentration (in $mg g^{- 1}$ ) of adsorbed phenol from $20 mg g^{- 1}$ aqueous solution of phenol will be ___. Use : $lo g_{10} 2 = 0.3$

JEE Advanced 2019

LEVELJEE Advanced

Molar conductivity ( $Λ_{m}$ ) of aqueous solution of sodium stearate, which behaves as a strong electrolyte, is recorded at varying concentration(c) of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in the solution? (Critical micelle concentration (CMC) is marked with an arrow in the figures.)

When O $_{2}$ is adsorbed on a metallic surface, electron transfer occurs from the metal to O $_{2}$ . The TRUE, statement (s) regarding this adsorption is (are)

* Multiple Correct Options

(A)

_{2}

π_{2 p}^{*}

of O

_{2}

is increased

(D)

bond length of O

_{2}

is increased

JEE Advanced 2016

LEVELJEE Advanced

The qualitative sketches I , II and III given below show the variation of surface tension with molar concentration of three different aqueous solutions of $KCl$ , $CH_{3} OH$ and $CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}$ at room temperature. The correct assignment of the sketches is -

(A)

I :

KCl

, II :

CH_{3} OH

, III :

CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}

(B)

I :

CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}

, II :

CH_{3} OH

, III :

KCl

(C)

I :

KCl

, II :

CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}

, III :

CH_{3} OH

(D)

I :

CH_{3} OH

, II :

KCl

, III :

CH_{3} (CH_{2})_{11} OSO_{3}^{-} Na^{+}

JEE Main 2021

LEVELJEE Advanced

$CH_{4}$ is adsorbed on $1 g$ charcoal at $0^{\circ} C$ 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 $200 mm$ of $Hg$ . The volume of $CH_{4}$ adsorbed at $300 mm$ of $Hg$ is $1 0^{x} mL$ . The value of $x$ is ....... $\times 1 0^{- 2}$ . (Nearest integer) [Use $lo g_{10} 2 = 0.3010$ , $lo g_{10} 3 = 0.4771$ ]

JEE Advanced 2021

LEVELJEE Main

The correct statement(s) related to colloids is(are)

* Multiple Correct Options

(A)

The process of precipitating colloidal sol by an electrolyte is called peptization.

(B)

Colloidal solution freezes at higher temperature than the true solution at the same concentration.

(C)

Surfactants form micelle above critical micelle concentration (CMC). CMC depends on temperature

(D)

Micelles are macromolecular colloids.

JEE Main 2021

LEVELJEE Main

Sodium stearate $CH_{3} (CH_{2})_{16} COO^{-} Na^{+}$ is an anionic surfactant which forms micelles in oil. Choose the correct statement for it from the following. [2021, 22 July Shift-I]

(A)

It forms spherical micelles with

CH_{3} (CH_{2})_{16}

group pointing towards the centre of sphere.

(B)

It forms non-spherical micelles with

- COO^{-}

group pointing outwards on the surface.

(C)

It forms spherical micelles with

CH_{3} (CH_{2})_{16}

group pointing outwards on the surface of sphere.

(D)

It forms non-spherical micelles with

CH_{3} (CH_{2})_{16}

group pointing towards the centre.

JEE Main 2020

LEVELJEE Main

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 adsorbed more than nitrogen gas. (C) On adsorption, the residual force acting along the surface of the adsorbent increases. (D) With increase in temperature, the equilibrium concentration of adsorbate increases.

The correct statement(s) about surface properties is (are)

* Multiple Correct Options

(A)

Cloud is an emulsion type of colloid in which liquid is dispersed phase and gas is dispersion medium

(B)

Adsorption is accompanied by decrease in enthalpy and decrease in entropy of the system.

(C)

Brownian motion of colloidal particles does not depend on the size of the particles but depends on viscosity of the solution.

(D)

The critical temperatures of ethane and nitrogen and 563 K and 126 K, respectively. The adsorption of ethane will be more than that of nitrogen on same amount of activated charcoal at a given temperature.

JEE Advanced 2023

LEVELJEE Main

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 dispersed phase and the dispersion medium are liquid. (III) Micelles are produced by dissolving a surfactant in any solvent at any temperature. (IV) Tyndall effect can be observed from a colloidal solution with dispersed phase having the same refractive index as that of the dispersion medium. The option with the correct set of statements is

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

* Multiple Correct Options

(A)

Chemisorption results in a unimolecular layer.

(B)

The enthalpy change during physisorption is in the range of

100

140 kJ mol^{- 1}

(C)

Chemisorption is an endothermic process.

(D)

Lowering the temperature favors physisorption processes.

JEE Main 2020

LEVELJEE Main

An ionic micelle is formed on the addition of

(A)

liquid diethyl ether to aqueous NaCl solution

(B)

sodium stearate to pure toluene excess water to liquid

JEE Main 2021

LEVELJEE Main

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

(A)

AgI / I^{-}

(B)

AgI / Ag^{+}

(C)

KI / NO_{3}^{-}

(D)

AgNO_{3} / NO_{3}^{-}

JEE Main 2021

LEVELJEE Main

100 mL of $0.0018% (w/v)$ solution of $Cl^{-}$ ion was the minimum concentration of $Cl^{-}$ required to precipitate a negative sol in one h. The coagulating value of $Cl^{-}$ ion is ......... (Nearest integer)

JEE Main 2021

LEVELJEE Main

Match List-I with List-II. $List-I (Process) (A) Deacon’s process (B) Contact process (C) Cracking of hydrocarbons (D) Hydrogenation of vegetable oils List-II (Catalyst) (i) ZSM-5 (ii) C u C l_{2} (iii) Particles ’Ni’ (iv) V_{2} O_{5}$ Choose the most appropriate answer from the options given below.

(A)

A-(ii), B-(iv), C-(i), D-(iii)

(B)

A-(i), B-(iii), C-(ii), D-(iv)

(C)

A-(iii), B-(i), C-(iv), D-(ii)

(D)

A-(iv), B-(ii), C-(i), D-(iii)

JEE Main 2020

LEVELJEE Main

For the following Assertion and Reason the correct option is Assertion For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements. Reason The reactants are most strongly adsorbed on group 7-9 elements.

(A)

The Assertion is true, but the Reason is false.

(B)

Both Assertion and Reason are true, but the Reason is not the correct explanation for the Assertion.

(C)

Both Assertion and Reason are true and the Reason is the correct explanation for the Assertion.

(D)

Both Assertion and Reason are false.

JEE Main 2019

LEVELJEE Main

Among the following, the false statement is

(A)

Tyndall effect can be used to distinguish between a colloidal solution and a true solution

(B)

It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane

(C)

Lyophilic sol can be coagulated by adding an electrolyte

(D)

Latex is a colloidal solution of rubber particles which are positively charged

JEE Main 2021

LEVELJEE Main

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 ; $p =$ pressure)

A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation $\frac{x}{m} = K p^{0.5}$ . Adsorption of the gas increases with

(A)

increase in

p

and increase in

T

(B)

increase in

p

and decrease in

T

(C)

decrease in

p

and decrease in

T

(D)

decrease in

p

and increase in

T

Micro-Topic Strategy Matrix

Adsorption

Catalyst

Colloids, Micelles and and Emulsions

Chapter Elite-20 Challenge Zone

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } When O2​ is adsorbed on a metallic surface, electron transfer occurs from the metal to O2​. The TRUE, statement (s) regarding this adsorption is (are)

The correct statement(s) related to colloids is(are)

The correct statement(s) about surface properties is (are)

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

An ionic micelle is formed on the addition of

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

For the following Assertion and Reason the correct option is Assertion For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements. Reason The reactants are most strongly adsorbed on group 7-9 elements.

Among the following, the false statement is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation mx​=Kp0.5. Adsorption of the gas increases with

When O $_{2}$ is adsorbed on a metallic surface, electron transfer occurs from the metal to O $_{2}$ . The TRUE, statement (s) regarding this adsorption is (are)

A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation $\frac{x}{m} = K p^{0.5}$ . Adsorption of the gas increases with