Question 1: Palette 1/12

JEE Advanced 2023 MCQ

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 :

A

(I) and (II)

B

(II) and (III)

C

(III) and (IV)

D

(II) and (IV)

Question 2: Palette 2/12

JEE Advanced 2022 MSQ

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

A

Chemisorption results in a unimolecular layer.

B

The enthalpy change during physisorption is in the range of 100 to $140 \mathrm{~kJ} \mathrm{~mol}^{-1}$.

C

Chemisorption is an endothermic process.

D

Lowering the temperature favors physisorption processes.

Question 3: Palette 3/12

JEE Advanced 2021 MSQ

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

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.

Question 4: Palette 4/12

JEE Advanced 2017 MSQ

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

A

Adsorption is accompanied by decrease in ethalpy and decrease in entropy of the system

B

The critical temperatures of ethane and nitrogen are $563$ $K$ 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

C

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

D

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

Question 5: Palette 5/12

JEE Advanced 2015 MSQ

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)

A

O₂ is physisorbed

B

Heat is released

C

Occupancy of $\pi _{2p}^*$ of O₂ is increased

D

Bond length of O₂ is increased

Question 6: Palette 6/12

JEE Advanced 2013 MCQ

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25^oC. For this process, the correct statement is

A

The adsorption requires activation at 25^oC.

B

The adsorption is accompanied by a decrease in enthalpy

C

The adsorption increases with increase of temperature

D

The adsorption is irreversible

Question 7: Palette 7/12

JEE Advanced 2012 MSQ

The given graphs/data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is(are) correct?

A

I is physisorption and II is chemisorption.

B

I is physisorption and III is chemisorption.

C

IV is chemisorption and II is chemisorption.

D

IV is chemisorption and III is chemisorption.

Question 8: Palette 8/12

JEE Advanced 2012 MSQ

Choose the correct reason for the stability of the Iyophobic colloidal particles

A

Preferential adsorption of ions on their surface from the solution

B

Preferential adsorption of solvent on their surface from the solution

C

Attraction between different particles having opposite charges on their surface

D

Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles.

Question 9: Palette 9/12

JEE Advanced 2011 MSQ

The correct statement(s) pertaining to the adsorption of a gas on a solid surface is (are)

A

Adsorption is always exothermic

B

Physisorption may transform into chemisorption at high temperature

C

Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature

D

Chemisorption is more exothermic than physisorption, however it is very slow due to higher energy of activation

Question 10: Palette 10/12

JEE Advanced 2009 MCQ

Among the electrolytes Na$_2$SO$_4$, CaCl$_2$, Al$_2$(SO$_4$)$_3$ and NH$_4$Cl, the most effective coagulating agent for Sb$_2$S$_3$ sol is

A

Na$_2$SO$_4$

B

CaCl$_2$

C

Al$_2$(SO$_4$)$_3$

D

NH$_4$Cl

Question 11: Palette 11/12

JEE Advanced 2008 MCQ

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

A

CH$_3$(CH$_2$)$_{15}$N$^+$(CH$_3$)$_3$Br$^-$

B

CH$_3$(CH$_2$)$_{11}$OSO$_3^-$Na$^+$

C

CH$_3$(CH$_2$)$_6$COO$^-$Na$^+$

D

CH$_3$(CH$_2$)$_{11}$N$^+$(CH$_3$)$_3$Br$^-$

Question 12: Palette 12/12

JEE Advanced 2007 MCQ

Statement 1 : Micelles are formed by surfactant molecules above the critical micellar concentration (CMC).

Statement 2 : The conductivity of a solution having surfactant molecules decreases sharply at the CMC.

A

Statement 1 is True, Statement 2 is True, Statement 2 is a CORRECT explanation for Statement 1

B

Statement 1 is True, Statement 2 is True, Statement 2 is NOT a CORRECT explanation for Statement 1

C

Statement 1 is True, Statement 2 is False

D

Statement 1 is False, Statement 2 is True