Adsorption

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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 2017

LEVELJEE Main

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 2015

LEVELJEE Advanced

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 2022

LEVELJEE Main

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 2019

LEVELJEE Main

Given, $Gas : Critical temp./K H_{2} 33 C H_{4} 190 C O_{2} 304 S O_{2} 630$ On the basis of data given above, predict which of the following gases shows least adsorption on a definite amount of charcoal?

(A)

C H_{4}

(B)

S O_{2}

(C)

C O_{2}

(D)

H_{2}

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

LEVELJEE Main

According to Freundlich adsorption isotherm which of the following is correct?

(A)

\frac{x}{m} \propto p^{0}

(B)

\frac{x}{m} \propto p^{1}

(C)

\frac{x}{m} \propto p^{1/ n}

(D)

All of the above are correct for different range of pressure

JEE Main 2020

LEVELJEE Main

Adsorption of a gas follows Freundlich adsorption isotherm. If $x$ is the mass of the gas adsorbed on mass $m$ of the adsorbent, the correct plot of $\frac{x}{m}$ versus $p$ is

Which of the following statements is incorrect regarding physisorptions?

(A)

It occurs because of van der Waals' forces

(B)

More easily liquefiable gases are adsorbed readily

(C)

Under high pressure, it results into multi molecular layer on adsorbent surface

(D)

Enthalpy of adsorption (

Δ H_{adsorption}

) is low and positive

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 Main 2019

LEVELJEE Main

Adsorption of a gas follows Freundlich adsorption isotherm. $x$ is the mass of the gas adsorbed on mass $m$ of the adsorbent. The plot of $lo g \frac{x}{m}$ versus $lo g p$ is shown in the given graph. $\frac{x}{m}$ is proportional to

(A)

p^{2/3}

(B)

p^{3/2}

(C)

p^{3}

(D)

p^{2}

JEE Main 2020

LEVELJEE Main

The mass of gas adsorbed, $x$ per unit mass of adsorbate, $m$ was measured at various pressures, $p$ . A graph between $lo g \frac{x}{m}$ and $lo g p$ gives a straight line with slope equal to 2 and the intercept equal to 0.4771. The value of $\frac{x}{m}$ at a pressure of 4 atm is (Given, $lo g 3 = 0.4771$ )

JEE Main 2021

LEVELJEE Main

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 doubled. The value of $n$ in the Freundlich isotherm equation is ...... $\times 1 0^{- 2}$ . (Round off to the nearest integer)

JEE Main 2019

LEVELJEE Main

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 $p$ . $\frac{x}{m}$ is proportional to

(A)

p^{2}

(B)

p^{1/4}

(C)

p^{1/2}

(D)

p

JEE Main 2021

LEVELJEE Main

In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption $(\frac{x}{m})$ is directly proportional to $p^{x}$ . The value of $x$ is

\infty

(D)

\frac{1}{n}

JEE Main 2016

LEVELJEE Main

For a linear plot of $lo g (x / m)$ versus $lo g p$ in a Freundlich adsorption isotherm, which of the following statements is correct? ( $k$ and $n$ are constants)

(A)

1/ n

appears as the intercept

(B)

Only

1/ n

appears as the slope

(C)

lo g (\frac{1}{n})

appears as the intercept

(D)

Both

k

and

1/ n

appear in the slope term

JEE Main 2019

LEVELJEE Main

The correct match between item-I and Item-II is $A. Benzaldehyde B. Alumina C. Acetonitrile P. Dynamic phase Q. Adsorbent R. Adsorbate$

(A)

\to

(R); (B)

\to

(Q); (C)

\to

(P)

(B)

(A)

\to

(P); (B)

\to

(R); (C)

\to

(Q)

(C)

(A)

\to

(Q); (B)

\to

(P); (C)

\to

(R)

(D)

(A)

\to

(Q); (B)

\to

(R); (C)

\to

(P)

JEE Main 2015

LEVELJEE Main

3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06 N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is

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.

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 activated charcoal. Reason (R) $SO_{2} (g)$ has a higher critical temperature than $H_{2} (g)$ . In the light of the above statements, choose the most appropriate answer from the options given below.

(A)

Both A and R are correct but R is not the correct explanation of A

(B)

Both A and R are correct and R is the correct explanation of A.

(C)

A is not correct but R is correct.

(D)

A is correct but R is not correct.

JEE Main 2020

LEVELJEE Main

A mixture of gases $O_{2}$ , $H_{2}$ and $CO$ are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is

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

(A)

Δ H > 0, Δ S > 0

(B)

Δ H > 0, Δ S < 0

(C)

Δ H < 0, Δ S < 0

(D)

Δ H < 0, Δ S > 0

JEE Main 2021

LEVELJEE Main

In Freundlich adsorption isotherm, slope of $A B$ line is

(A)

n

with (

n = 0.1

0.5

)

(B)

lo g n

with (

n > 1

)

(C)

lo g \frac{1}{n}

with (

n < 1

)

(D)

\frac{1}{n}

with

(\frac{1}{n} = 0 to 1)

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

.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 option(s) related to adsorption processes is(are)

.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

According to Freundlich adsorption isotherm which of the following is correct?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Adsorption of a gas follows Freundlich adsorption isotherm. If x is the mass of the gas adsorbed on mass m of the adsorbent, the correct plot of mx​ versus p is

Which of the following statements is incorrect regarding physisorptions?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption (mx​) is directly proportional to px. The value of x is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } For a linear plot of log(x/m) versus logp in a Freundlich adsorption isotherm, which of the following statements is correct? (k and n are constants)

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The correct match between item-I and Item-II is A. BenzaldehydeB. AluminaC. Acetonitrile​P. Dynamic phaseQ. AdsorbentR. Adsorbate​

3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06 N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } A mixture of gases O2​, H2​ and CO are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is

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

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } In Freundlich adsorption isotherm, slope of AB line is

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

Adsorption of a gas follows Freundlich adsorption isotherm. If $x$ is the mass of the gas adsorbed on mass $m$ of the adsorbent, the correct plot of $\frac{x}{m}$ versus $p$ is

In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption $(\frac{x}{m})$ is directly proportional to $p^{x}$ . The value of $x$ is

For a linear plot of $lo g (x / m)$ versus $lo g p$ in a Freundlich adsorption isotherm, which of the following statements is correct? ( $k$ and $n$ are constants)

The correct match between item-I and Item-II is $A. Benzaldehyde B. Alumina C. Acetonitrile P. Dynamic phase Q. Adsorbent R. Adsorbate$

A mixture of gases $O_{2}$ , $H_{2}$ and $CO$ are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is

In Freundlich adsorption isotherm, slope of $A B$ line is