Question 1: Palette 1/98

JEE Mains 2024 MCQ

The adsorbent used in adsorption chromatography is/are -

A. silica gel

B. alumina

C. quick lime

D. magnesia

Choose the most appropriate answer from the options given below :

A

C and D only

B

A only

C

B only

D

A and B only

Question 2: Palette 2/98

JEE Mains 2024 MCQ

'Adsorption' principle is used for which of the following purification method?

A

Chromatography

B

Sublimation

C

Distillation

D

Extraction

Question 3: Palette 3/98

JEE Mains 2023 MCQ

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 much smaller than wavelength of light to show Tyndall effect.

Reason R : The light scatters in all directions when the size of particles is large enough.

In the light of the above statements, choose the correct answer from the options given below:

A

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

B

A is true but R is false

C

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

D

A is false but R is true

Question 4: Palette 4/98

JEE Mains 2023 MCQ

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

A

Film of lyophobic sol is formed over lyophilic sol.

B

Lyophilic sol is dispersed in lyophobic sol.

C

Film of lyophilic sol is formed over lyophobic sol.

D

Lyophobic sol is coagulated

Question 5: Palette 5/98

JEE Mains 2023 MCQ

Four gases A, B, C and D have critical temperatures $5.3,33.2,126.0$ and $154.3 \mathrm{~K}$ respectively. For their adsorption on a fixed amount of charcoal, the correct order is:

A

D > C > B > A

B

C > B > D > A

C

D > C > A > B

D

C > D > B > A

Question 6: Palette 6/98

JEE Mains 2023 MCQ

Ferric chloride is applied to stop bleeding because -

A

$\mathrm{FeCl}_{3}$ reacts with the constituents of blood which is a positively charged sol.

B

Blood absorbs $\mathrm{FeCl}_{3}$ and forms a complex.

C

$\mathrm{Cl}^{-}$ ions cause coagulation of blood.

D

$\mathrm{Fe}^{3+}$ ions coagulate blood which is a negatively charged sol.

Question 7: Palette 7/98

JEE Mains 2023 MCQ

The enthalpy change for the adsorption process and micelle formation respectively are

A

$\mathrm{\Delta H_{ads} > 0~and~\Delta H_{mic} < 0}$

B

$\mathrm{\Delta H_{ads} > 0~and~\Delta H_{mic} > 0}$

C

$\mathrm{\Delta H_{ads} < 0~and~\Delta H_{mic} < 0}$

D

$\mathrm{\Delta H_{ads} < 0~and~\Delta H_{mic} > 0}$

Question 8: Palette 8/98

JEE Mains 2023 MCQ

Which of the following represent the Freundlich adsorption isotherms?

Choose the correct answer from the options given below:

A

B, C, D only

B

A, B only

C

A, B, D only

D

A, C, D only

Question 9: Palette 9/98

JEE Mains 2023 MCQ

In figure, a straight line is given for Freundrich Adsorption ($y=3x+2.505$). The value of $\frac{1}{n}$ and $\log \mathrm{K}$ are respectively.

A

0.3 and log 2.505

B

3 and 2.505

C

3 and 0.7033

D

0.3 and 0.7033

Question 10: Palette 10/98

JEE Mains 2023 MCQ

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Amongst $\mathrm{He}, \mathrm{Ne}, \mathrm{Ar}$ and $\mathrm{Kr}$; 1$\mathrm{g}$ of activated charcoal adsorbs more of $\mathrm{Kr}$.

Reason R: The critical volume $\mathrm{V}_{\mathrm{c}}\left(\mathrm{cm}^{3} \mathrm{~mol}^{-1}\right)$ and critical pressure $\mathrm{P}_{\mathrm{c}}$ (atm) is highest for Krypton but the compressibility factor at critical point $\mathrm{Z}_{\mathrm{c}}$ is lowest for Krypton.

In the light of the above statements, choose the correct answer from the options given below

A

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

B

A is false but R is true

C

Both A and R are true but R is NOT the correct explanation of A

D

A is true but R is false

Question 11: Palette 11/98

JEE Mains 2023 MCQ

Match List I with List II

LIST I		LIST II
A.	Physisorption	I.	Single Layer Adsorption
B.	Chemisorption	II.	$20-40 \mathrm{~kJ} \mathrm{~mol}^{-1}$
C.	$\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \stackrel{\mathrm{Fe}(\mathrm{s})}{\longrightarrow} 2 \mathrm{NH}_{3}(\mathrm{~g})$	III.	Chromatography
D.	Analytical Application or Adsorption	IV.	Heterogeneous catalysis

Choose the correct answer from the options given below:

A

A - III, B - IV, C - I, D - II

B

A - II, B - III, C - I, D - IV

C

A - II, B - I, C - IV, D - III

D

A - IV, B - II, C - III, D - I

Question 12: Palette 12/98

JEE Mains 2023 MCQ

Adding surfactants in non polar solvent, the micelles structure will look like

A

d

B

a

C

c

D

b

Question 13: Palette 13/98

JEE Mains 2023 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags.

Reason (R) : Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning.

In the light of the above statements, choose the correct answer from the options given below :

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

(A) is true but (R) is false

C

(A) is false but (R) is true

D

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

Question 14: Palette 14/98

JEE Mains 2023 MCQ

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 colloidal particles under the influence of applied electric potential towards oppositely charged electrodes.
C.	Electro osmosis	III.	Solvent molecules pass through semi permeable membrane towards solution side.
D.	Electrophoresis	IV.	Dispersion medium moves in an electric field.

Choose the correct answer from the options given below :

A

A-III, B-I, C-IV, D-II

B

A-III, B-I, C-II, D-IV

C

A-I, B-III, C-IV, D-II

D

A-I, B-III, C-II, D-IV

Question 15: Palette 15/98

JEE Mains 2023 MCQ

Which of the following salt solutions would coagulate the colloid solution formed when $\mathrm{FeCl_3}$ is added to $\mathrm{NaOH}$ solution, at the fastest rate?

A

10 mL of 0.15 mol dm$^{-3}$ CaCl$_2$

B

10 mL of 0.2 mol dm$^{-3}$ AlCl$_3$

C

10 mL of 0.1 mol dm$^{-3}$ Na$_2$SO$_4$

D

10 mL of 0.1 mol dm$^{-3}$ Ca$_3$(PO$_4$)$_2$

Question 16: Palette 16/98

JEE Mains 2023 MCQ

The variation of the rate of an enzyme catalyzed reaction with substrate concentration is correctly represented by graph :

A

(a)

B

(b)

C

(d)

D

(c)

Question 17: Palette 17/98

JEE Mains 2023 MCQ

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 colloidal particles, the potential difference between the fixed layer and the diffused layer of same charges is called the electrokinetic potential or zeta potential.

In the light of the above statements, choose the correct answer from the options given below

A

Both Statement I and Statement II are false

B

Statement I is true and Statement II is false

C

Both Statement I and Statement II are true

D

Statement I is false but Statement II is true

Question 18: Palette 18/98

JEE Mains 2022 MCQ

Given below are the critical temperatures of some of the gases:

Gas	Critical temperature (K)
He	5.2
CH$_4$	190.0
CO$_2$	304.2
NH$_3$	405.5

The gas showing least adsorption on a definite amount of charcoal is

A

He

B

CH$_4$

C

CO$_2$

D

NH$_3$

Question 19: Palette 19/98

JEE Mains 2022 MCQ

$100 \mathrm{~mL}$ of $5 \%\,(\mathrm{w} / \mathrm{v})$ solution of $\mathrm{NaCl}$ in water was prepared in $250 \mathrm{~mL}$ beaker. Albumin from the egg was poured into $\mathrm{NaCl}$ solution and stirred well. This resulted in a/an :

A

Lyophilic sol

B

Lyophobic sol

C

Emulsion

D

Precipitate

Question 20: Palette 20/98

JEE Mains 2022 MCQ

Match List - I with List - II.

	List - I Reaction		List - II Catalyst
(A)	$4N{H_3}(g) + 5{O_2}(g) \to 4NO(g) + 6{H_2}O(g)$	(I)	$NO(g)$
(B)	${N_2}(g) + 3{H_2}(g) \to 2N{H_3}(g)$	(II)	${H_2}S{O_4}(l)$
(C)	${C_{12}}{H_{22}}{O_{11}}(aq) + {H_2}O(l) \to \mathop {{C_6}{H_{12}}{O_6}}\limits_{Glu\cos e} + \mathop {{C_6}{H_{12}}{O_6}}\limits_{Fructose} $	(III)	$Pt(s)$
(D)	$2S{O_2}(g) + {O_2}(g) \to 2S{O_3}(g)$	(IV)	$Fe(s)$

Choose the correct answer from the options given below :

A

$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{III}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{IV})$

B

$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{II}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{IV})$

C

$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{IV}),(\mathrm{C})-(\mathrm{II}),(\mathrm{D})-(\mathrm{I})$

D

(A) - (III), (B) - (II), (C) - (IV), (D) - (I)

Question 21: Palette 21/98

JEE Mains 2022 MCQ

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 diffusion through a parchment paper.

Reason (R) : Particles in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper.

In the light of the above statements, choose the correct answer from the options given below :

A

Both (A) and (R) are correct and (R) is the correct explanation of (A)

B

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

C

(A) is correct but (R) is not correct

D

(A) is not correct but (R) is correct

Question 22: Palette 22/98

JEE Mains 2022 MCQ

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 increases, it appears purple then blue and finally gold.

Reason R : The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles.

In the light of the above statements, choose the most appropriate answer from the options given below.

A

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

B

Both A and R are true but R is NOT the correct explanation of A.

C

A is true but R is false.

D

A is false but R is true.

Question 23: Palette 23/98

JEE Mains 2022 MCQ

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 entropy change is positive.

D. The entropy change is negative.

A

A and D only

B

A and C only

C

B and C only

D

B and D only

Question 24: Palette 24/98

JEE Mains 2022 MCQ

TLC analysis of a mixture having 3 components (A, B, C) using silica gel as the stationary phase gave following R_f values; for A = 0.72, B = 0.48, C = 0.20.

Regarding the above observations, which one of the following statements is not correct for column chromatography of the mixture?

A

A is the most non-polar component

B

C is the most soluble component in mobile phase

C

A will be eluted first

D

C is the most strongly absorbed component

Question 25: Palette 25/98

JEE Mains 2022 MCQ

A 42.12% (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol in 2 hours is :

[Given : Molar mass : Na = 23.0 g mol^$-$1 ; Cl = 35.5 g mol^$-$1]

A

36 m mol L^$-$1

B

36 mol L^$-$1

C

1440 mol L^$-$1

D

1440 m mol L^$-$1

Question 26: Palette 26/98

JEE Mains 2022 MCQ

Which of the following is a correct statement?

A

Brownian motion destabilises sols.

B

Any amount of dispersed phase can added to emulsion without destablising it.

C

Mixing two oppositely charged sols in equal amount neutralises charges and stabilises colloids.

D

Presence of equal and similar charges on colloidal particles provides stability to the colloidal solution.

Question 27: Palette 27/98

JEE Mains 2022 MCQ

Match List - I with List - II :

	List-I		List-II
(A)	negatively charged sol	(I)	$F{e_2}{O_3}\,.\,x{H_2}O$
(B)	macromolecular colloid	(II)	CdS sol
(C)	positively charged sol	(III)	Starch
(D)	Cheese	(IV)	a gel

Choose the correct answer from the options given below:

A

(A) - (II), (B) - (III), (C) - (IV), (D) - (I)

B

(A) - (II), (B) - (I), (C) - (III), (D) - (IV)

C

(A) - (II), (B) - (III), (C) - (I), (D) - (IV)

D

(A) - (I), (B) - (III), (C) - (II), (D) - (IV)

Question 28: Palette 28/98

JEE Mains 2022 MCQ

The Zeta potential is related to which property of colloids?

A

Colour

B

Tyndall effect

C

Charge on the surface of colloidal particles

D

Brownian movement

Question 29: Palette 29/98

JEE Mains 2022 MCQ

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)	Negatively charged colloid	(IV)	FeCl$_3$ + hot water

Choose the correct answer from the options given below :

A

(A) - (II), (B) - (I), (C) - (IV), (D) - (III)

B

(A) - (III), (B) - (I), (C) - (IV), (D) - (II)

C

(A) - (II), (B) - (I), (C) - (III), (D) - (IV)

D

(A) - (III), (B) - (II), (C) - (I), (D) - (IV)

Question 30: Palette 30/98

JEE Mains 2022 MCQ

Incorrect statement for Tyndall effect is :

A

The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.

B

The diameter of the dispersed particles is much smaller than the wavelength of the light used.

C

During projection of movies in the cinemas hall, Tyndall effect is noticed.

D

It is used to distinguish a true solution from a colloidal solution.

Question 31: Palette 31/98

JEE Mains 2022 MCQ

Using very little soap while washing clothes, does not serve the purpose of cleaning of clothes, because :

A

soap particles remain floating in water as ions.

B

the hydrophobic part of soap is not able to take away grease.

C

the micelles are not formed due to concentration of soap, below its CMC value.

D

colloidal structure of soap in water is completely disturbed.

Question 32: Palette 32/98

JEE Mains 2022 MCQ

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 emulsion, excess of electrolyte is added.

In the light of the above statements, choose the most appropriate answer from the options given below :

A

Both Statement I and Statement II are correct.

B

Both Statement I and Statement II are incorrect.

C

Statement I is correct but Statement II is incorrect.

D

Statement I is incorrect but Statement II is correct.

Question 33: Palette 33/98

JEE Mains 2021 MCQ

Match List - I with List - II :


Choose the most appropriate answer from the options given below.

A

(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)

B

(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)

C

(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)

D

(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

Question 34: Palette 34/98

JEE Mains 2021 MCQ

Select the graph that correctly describes the adsorption isotherms at two temperatures T₁, and T₂ (T₁ > T₂) for a gas :

(x - mass of the gas absorbed ; m - mass of adsorbent ; P - pressure)

A

B

C

D

Question 35: Palette 35/98

JEE Mains 2021 MCQ

Lyophilic sols are more stable than lyophobic sols because :

A

there is a strong electrostatic repulsion between the negatively charged colloidal particles.

B

the colloidal particles have positive charge.

C

the colloidal particles have no charge.

D

the colloidal particles are solvated.

Question 36: Palette 36/98

JEE Mains 2021 MCQ

Tyndall effect is more effectively shown by :

A

true solution

B

lyophilic colloid

C

lyophobic colloid

D

suspension

Question 37: Palette 37/98

JEE Mains 2021 MCQ

The sol given below with negatively charged colloidal particles is :

A

FeCl₃ added to hot water

B

KI added to AgNO₃ solution

C

AgNO₃ added to KI solution

D

Al₂O₃.xH₂O in water

Question 38: Palette 38/98

JEE Mains 2021 MCQ

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

A

$\Delta$H > 0, $\Delta$S > 0

B

$\Delta$H > 0, $\Delta$S < 0

C

$\Delta$H < 0, $\Delta$S < 0

D

$\Delta$H < 0, $\Delta$S > 0

Question 39: Palette 39/98

JEE Mains 2021 MCQ

Match List I with List II :

List-I Example of colloids	List - II Classification
(a) Cheese	(i) dispersion of liquid in liquid
(b) Pumice stone	(ii) dispersion of liquid in gas
(c) Hair cream	(iii) dispersion of gas in solid
(d) Cloud	(iv) dispersion of liquid in solid

Choose the most appropriate answer from the options given below

A

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

B

(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)

C

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

D

(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

Question 40: Palette 40/98

JEE Mains 2021 MCQ

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

AgNO₃ / NO$_3^ - $

Question 41: Palette 41/98

JEE Mains 2021 MCQ

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 light used.

(B) The diameter of the colloidal particles is much smaller than the wavelength of light used.

(C) The diameter of the colloidal particles is much larger than the wavelength of light used.

(D) The refractive indices of the dispersed phase and the dispersion medium are comparable.

(E) The dispersed phase has a very different refractive index from the dispersion medium.

Choose the most appropriate conditions from the options given below :

A

(A) and (E) only

B

(C) and (D) only

C

(A) and (D) only

D

(B) and (E) only

Question 42: Palette 42/98

JEE Mains 2021 MCQ

The charges on the colloidal CdS sol and TiO₂ sol are, respectively :

A

positive and positive

B

positive and negative

C

negative and negative

D

negative and positive

Question 43: Palette 43/98

JEE Mains 2021 MCQ

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

A

Na⁺

B

Ba²⁺

C

PO$_4^{3 - }$

D

SO$_4^{2 - }$

Question 44: Palette 44/98

JEE Mains 2021 MCQ

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

A

foam

B

aerosol

C

solid sol

D

gel

Question 45: Palette 45/98

JEE Mains 2021 MCQ

The INCORRECT statements below regarding colloidal solutions is :

A

The flocculating power of Al³⁺ is more than that of Na⁺.

B

A colloidal solutions shows Brownian motion of colloidal particles.

C

An ordinary filter paper can stop the flow of colloidal particles.

D

A colloidal solutions shows colligative properties.

Question 46: Palette 46/98

JEE Mains 2021 MCQ

The nature of charge on resulting colloidal particles when FeCl₃ is added to excess of hot water is :

A

neutral

B

sometimes positive and sometimes negative

C

positive

D

negative

Question 47: Palette 47/98

JEE Mains 2021 MCQ

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

A

They do not require electrolytes for stability.

B

The sols cannot be easily coagulated.

C

These sols are reversible in nature.

D

Their viscosity is of the order of that of H₂O.

Question 48: Palette 48/98

JEE Mains 2021 MCQ

In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption $\left( {{x \over m}} \right)$ is directly proportional to P^x. The value of x is :

A

$\infty $

B

zero

C

1

D

${{1 \over n}}$

Question 49: Palette 49/98

JEE Mains 2021 MCQ

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

A

Mg(HCO₃)₂

B

NaHCO₃

C

FeCl₃

D

FeSO₄

Question 50: Palette 50/98

JEE Mains 2021 MCQ

In Freundlich adsorption isotherm, slope of AB line is :

A

${1 \over n}$ with $\left( {{1 \over n} = 0\,to\,1} \right)$

B

n with (n, 0.1 to 0.5)

C

$\log {1 \over n}$ with $\left( {n < 1} \right)$

D

log n with (n > 1)

Question 51: Palette 51/98

JEE Mains 2020 MCQ

Kraft temperature is the temperature :

A

below which the aqueous solution of detergents starts freezing.

B

above which the formation of micelles takes place.

C

below which the formation of micelles takes place.

D

above which the aqueous solution of detergents starts boiling.

Question 52: Palette 52/98

JEE Mains 2020 MCQ

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 ${x \over m}$ versus p is :

A

B

C

D

Question 53: Palette 53/98

JEE Mains 2020 MCQ

Identify the correct molecular picture showing that happens at the critical micellar concentration (CMC) of an aqueous solution of a surfactant ( ◍ polar head; ∼ non-polar tail; ● water).

A

(C)

B

(A)

C

(D)

D

(B)

Question 54: Palette 54/98

JEE Mains 2020 MCQ

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

A

HCHO

B

Water

C

Eosin dye

D

Egg white

Question 55: Palette 55/98

JEE Mains 2020 MCQ

Match the following :

(i) Foam	(a) smoke
(ii) Gel	(b) cell fluid
(iii) Aerosol	(c) jellies
(iv) Emulsion	(d) rubber
	(e) froth
	(f) Milk

A

(i)-(e), (ii)-(c), (iii)-(a), (iv)-(f)

B

(i)-(d), (ii)-(b), (iii)-(a), (iv)-(e)

C

(i)-(d), (ii)-(b), (iii)-(e), (iv)-(f)

D

(i)-(b), (ii)-(c), (iii)-(e), (iv)-(d)

Question 56: Palette 56/98

JEE Mains 2020 MCQ

An ionic micelle is formed on the addition of :

A

excess water to liquid

B

excess water to liquid

C

liquid diethyl ether to aqueous NaCl solution

D

sodium stearate to pure toluene

Question 57: Palette 57/98

JEE Mains 2020 MCQ

Tyndall effect is observed when:

A

The diameter of dispersed particles is similar to the wavelenght of light used.

B

The diameter of dispersed particles is much smaller than the wavelength of light used.

C

The diameter of dispersed particles is much larger than the wavelength of light used.

D

The refractive index of dispersed phase is greater than that of the dispersion medium.

Question 58: Palette 58/98

JEE Mains 2020 MCQ

Amongst the following statements regarding adsorption, those that are valid are

(a) $\Delta $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

A

(c) and (d)

B

(a) and (b)

C

(d) and (a)

D

(b) and (c)

Question 59: Palette 59/98

JEE Mains 2020 MCQ

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

A

Van Arkel Method

B

Bredig’s Arc Method

C

Mond Process

D

Ostwald Process

Question 60: Palette 60/98

JEE Mains 2020 MCQ

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 :

A

B

C

D

Question 61: Palette 61/98

JEE Mains 2020 MCQ

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

Both assertion and reason are true and the reason is the correct explanation for the assertion.

B

The assertion is true, but the reason is false.

C

Both assertion and reason are true but the reason is not the correct explanation for the assertion.

D

Both assertion and reason are false.

Question 62: Palette 62/98

JEE Mains 2020 MCQ

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

A

AICl₃ > K₃[Fe(CN)₆] > K₂CrO₄ > KBr = KNO₃

B

K₃[Fe(CN)₆] < K₂CrO₄ < KBr = KNO₃ = AlCl₃

C

K₃[Fe(CN)₆] < K₂CrO₄ < AlCl₃ < KBr < KNO₃

D

K₃[Fe(CN)₆] > AlCl₃ > K₂CrO₄ > KBr > KNO₃

Question 63: Palette 63/98

JEE Mains 2019 MCQ

Among the following, the INCORRECT statement about colloids is :

A

The range of diameters of colloidal particles is between 1 and to 1000 nm

B

they are larger than small molecules and have high molar mass

C

They can scatter light

D

The osmotic pressure of a colloidal solution is of higher order than the true solution at the same concentration.

Question 64: Palette 64/98

JEE Mains 2019 MCQ

Peptization is a :

A

process of converting soluble particles to form colloidal solution

B

process of converting precipitate into colloidal solution

C

process of bringing colloidal molecule into solution

D

process of converting a colloidal solution into precipitate

Question 65: Palette 65/98

JEE Mains 2019 MCQ

The correct option among the following is :

A

Addition of alum to water makes it unfit for drinking.

B

Colloidal medicines are more effective because they have small surface area.

C

Colloidal paraticles in lyophobic sols can be precipitated by electrophoresis.

D

Brownian motion in colloidal solution is faster if the viscosity of the solution is very high.

Question 66: Palette 66/98

JEE Mains 2019 MCQ

A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation

${x \over m} = k{p^{0.5}}$

Adsorption of the gas increase with :

A

Decrease in p and increase in T

B

Increase in p and decrease in T

C

Decrease in p and decrease in T

D

Increase in p and increase in T

Question 67: Palette 67/98

JEE Mains 2019 MCQ

Match the catalysts (Column I) with products (Column II).

Column I	Column II
(A) V2O5	(i) Polyethylene
(B) TiCl4/Al(Me)3	(ii) ethanal
(C) PdCl2	(iii) H2SO4
(D) Iron Oxide	(iv) NH3

A

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

B

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

C

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

D

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

Question 68: Palette 68/98

JEE Mains 2019 MCQ

The aerosol is a kind of colloid in which :

A

solid is dispersed in gas

B

gas is dispersed in solid

C

gas is dispersed in liquid

D

liquid is dispersed in water

Question 69: Palette 69/98

JEE Mains 2019 MCQ

Adsorption of a gas follows freundlich adosorbed isotherm. x is the mass of the gas adsorbed on mass m of the adsorbent. The plot log $x \over m$ versus log p is shown in the given graph. $x \over m$ is proportional to :

A

p^2/3

B

p³

C

p²

D

p^3/2

Question 70: Palette 70/98

JEE Mains 2019 MCQ

Among the following the false statement is -

A

Lyophilic sol can be coagulated by adding an electrote

B

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

C

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

D

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

Question 71: Palette 71/98

JEE Mains 2019 MCQ

Given

Gas	H2	CH4	CO2	SO2
Critical Temperature / K	33	190	304	630

On the basis of data given above, predict which of the following gases shows least adsorption on a definite amount of charcoal ?

A

SO₂

B

CH₄

C

H₂

D

CO₂

Question 72: Palette 72/98

JEE Mains 2019 MCQ

Among the colloids cheese (C), milk (M), and smoke (S), the correct combination of the dispersed phase and dispersion medium, respectively is :

A

C : liquid in solid ; M : liquid in liquid ; S : solid in gas

B

C : liquid in solid ; M : liquid in solid ; S : solid in gas

C

C : solid in liquid ; M : liquid in liquid ; S : gas in solid

D

C : solid in liqid ; M : solid in liquid ; S : solid in gas

Question 73: Palette 73/98

JEE Mains 2019 MCQ

An example of solid sol is :

A

Butter

B

Hair cream

C

Gem stones

D

Paint

Question 74: Palette 74/98

JEE Mains 2019 MCQ

Haemoglobin and gold sol are examples of :

A

positively charged sols

B

negatively charged sols

C

Positively and negatively charged sols, respectively

D

negatively and positively charged sols, respectively

Question 75: Palette 75/98

JEE Mains 2019 MCQ

Which of the following is not an example of heterogenous catalytic reaction?

A

Ostwald's process

B

Combustion of coal

C

Hydrogenation of vegetable oils

D

Haber's process

Question 76: Palette 76/98

JEE Mains 2019 MCQ

For coagulation of arsenious sulphate sol, which one of the following salt solution will be most effective ?

A

BaCl₂

B

AlCl₃

C

NaCl

D

Na₃PO₄

Question 77: Palette 77/98

JEE Mains 2019 MCQ

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. ${x \over m}$ is proportional to :

A

P²

B

P${^{{1 \over 4}}}$

C

P${^{{1 \over 2}}}$

D

P

Question 78: Palette 78/98

JEE Mains 2018 MCQ

Which one of the following is not a property of physical adsorption?

A

Higher the pressure, mre the adsorption

B

Lower the temperature, more the adsorption

C

Greater the surface area, more the adsorption

D

Unilayer adsorption ocurs

Question 79: Palette 79/98

JEE Mains 2018 MCQ

If x gram of gas is adsorbed by m gram of adsorbent at pressure P, the plot of log ${x \over m}$ versus log P is linear. The slope of the plot is :
(n and k are constants and n > 1)

A

2 k

B

log k

C

n

D

${1 \over n}$

Question 80: Palette 80/98

JEE Mains 2018 MCQ

Which of the following statements about colloids is False ?

A

Freezing point of colloidal solution is lower than true solution at same concentration of a solute.

B

Colloidal particles can pass through ordinary filter paper.

C

When silver nitrate solution is added to potassium iodide solution, a negatively charged colloidal solution is formed.

D

When excess of electolyte is added to colloidal solution, colloidal particle will be precipitated.

Question 81: Palette 81/98

JEE Mains 2017 MCQ

Adsorption of a gas on a surface follows Freundlich adsorption isotherm. Plot of log ${x \over m}$ versus log p gives a straight line with slope equal to 0.5, then:

( ${x \over m}$ is the mass of the gas adsorbed per gram of adsorbent)

A

Adsorption is independent of pressure.

B

Adsorption is proportional to the pressure.

C

Adsorption is proportional to the square root of pressure.

D

Adsorption is proportional to the square of pressure.

Question 82: Palette 82/98

JEE Mains 2017 MCQ

Among the following, correct statement is :

A

Brownian movement is more pronounced for smaller particles than for bigger–particles

B

Sols of metal sulphides are lyophilic.

C

Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.

D

One would expect charcoal to adsorb chlorine more than hydrogen sulphide.

Question 83: Palette 83/98

JEE Mains 2017 MCQ

The Tyndall effect is observed only when following conditions are satisfied:
(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
(b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
(c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
(d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

A

(b) and (d)

B

(a) and (c)

C

(b) and (c)

D

(a) and (d)

Question 84: Palette 84/98

JEE Mains 2016 MCQ

Gold numbers of some colloids are : Gelatin : 0.005 - 0.01, Gum Arabic : 0.15 - 0.25; Oleate : 0.04 - 1.0; Starch : 15 - 25. Which among these is a better protective colloid ?

A

Gelatin

B

Gum Arabic

C

Oleate

D

Starch

Question 85: Palette 85/98

JEE Mains 2016 MCQ

A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process :

A

Enthalpy of adsorption is greater than 100 kJ mol⁻¹.

B

Energy of activation is low.

C

Adsorption is monolayer.

D

Adsorption increases with increase in temperature.

Question 86: Palette 86/98

JEE Mains 2016 MCQ

The most appropriate method of making egg-albumin sol is :

A

Break an egg carefully and transfer the transparent part of the content to 100 mL of 5% w/V saline solution and stir well

B

Break an egg carefully and transfer only the yellow part of the content to 100 mL of 5% w/V saline solution and stir well.

C

Keep the egg in boiling water for 10 minutes. After removing the shell, transfer the white part of the content to 100 mL of 5% w/V saline solution and homogenize with a mechanical shaker.

D

Keep the egg in boiling water for 10 minutes. After removing the shell, transfer the yellow part of the content to 100 mL of 5% w/V saline solutionand homogenize with a mechanical shaker.

Question 87: Palette 87/98

JEE Mains 2016 MCQ

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

A

Both k and 1/n appear in the slope term.

B

1/n appears as the intercept.

C

Only 1/n appears as the slope

D

log (1/n) appears as the intercept.

Question 88: Palette 88/98

JEE Mains 2015 MCQ

3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) 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:

A

36 mg

B

42 mg

C

54 mg

D

18 mg

Question 89: Palette 89/98

JEE Mains 2013 MCQ

The coagulating power of electrolytes having ions Na⁺, Al³⁺ and Ba²⁺ for arsenic sulphide sol increases in the order:

A

Na⁺ < Ba²⁺ < Al³⁺

B

Al³⁺ < Ba²⁺ < Na⁺

C

Ba²⁺ < Na⁺ < Al³⁺

D

Al³⁺ < Na⁺ < Ba²⁺

Question 90: Palette 90/98

JEE Mains 2012 MCQ

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

A

${x \over m} \propto {p^0}$

B

${x \over m} \propto {p^1}$

C

${x \over m} \propto {p^{1/n}}$

D

All the above are correct for different ranges of pressure

Question 91: Palette 91/98

JEE Mains 2009 MCQ

Which of the following statements is incorrect regarding physisorptions ?

A

It occurs because of vander Waal’s 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 ($\Delta H_{adsorption}$ ) is low and positive

Question 92: Palette 92/98

JEE Mains 2008 MCQ

Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is

A

D < A < C < B

B

C < B < D < A

C

A < C < B < D

D

B < D < A < C

Question 93: Palette 93/98

JEE Mains 2006 MCQ

In Langmuir’s model of adsorption of a gas on a solid surface

A

the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered

B

the adsorption at a single site on the surface may involve multiple molecules at the same time

C

the mass of gas striking a given area of surface is proportional to the pressure of the gas

D

the mass of gas striking a given area of surface is independent of the pressure of the gas

Question 94: Palette 94/98

JEE Mains 2005 MCQ

The volume of a colloidal particle, V_C as compared to the volume of a solute particle in a true solution V_S, could be

A

${V_C \over V_S } \simeq 1$

B

${V_C \over V_S } \simeq 10^{-3}$

C

${V_C \over V_S } \simeq 10^3$

D

${V_C \over V_S } \simeq 10^{23}$

Question 95: Palette 95/98

JEE Mains 2005 MCQ

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?

A

magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol.

B

sodium sulphate solution causes coagulation in both sols

C

mixing the sols has no effect

D

coagulation in both sols can be brought about by electrophoresis

Question 96: Palette 96/98

JEE Mains 2003 MCQ

Which one of the following characteristics is not correct for physical adsorption?

A

Adsorption increases with increase in temperature

B

Adsorption is spontaneous

C

Both enthalpy and entropy of adsorption are negative

D

Adsorption on solids is reversible

Question 97: Palette 97/98

JEE Mains 2002 MCQ

The formation of gas at the surface of tungsten due to adsorption is the reaction of order :

A

0

B

1

C

2

D

insufficient data

Question 98: Palette 98/98

JEE Mains 2002 MCQ

Alum helps in purifying water by :

A

forming Si complex with clay particles

B

sulphate part which combines with the dirt and removes it

C

coagulating the mud particles

D

making mud water soluble