Which of the following is a correct statement?

Question

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

Answer 1

The question asks us to identify the correct statement regarding colloidal solutions and their stability. Let us analyze each option:

Brownian motion destabilises sols: Brownian motion refers to the random movement of colloidal particles. This motion actually contributes to the stability of sols by preventing sedimentation, as the constant motion keeps the particles from settling. Therefore, this statement is incorrect.
Any amount of dispersed phase can be added to emulsion without destabilising it: In an emulsion, there is a limit to how much dispersed phase can be added. Adding more than the capacity of the continuous phase can indeed destabilize the emulsion, leading to separation. Thus, this statement is incorrect.
Mixing two oppositely charged sols in equal amount neutralises charges and stabilises colloids: When two oppositely charged sols are mixed, they can coagulate due to neutralization of charges, which often leads to destabilization rather than stabilization. Hence, this statement is incorrect.
Presence of equal and similar charges on colloidal particles provides stability to the colloidal solution: This is the correct statement. Colloidal particles having similar charges repel each other, which prevents them from coming together and settling down. This repulsion provides stability to the colloidal solution.

Based on the analysis, the correct answer is: Presence of equal and similar charges on colloidal particles provides stability to the colloidal solution. This is because like charges repel each other, preventing aggregation of particles, which enhances the stability of colloids.

Answer 2

The question asks us to identify the correct statement regarding colloidal solutions and their stability. Let us analyze each option:

Brownian motion destabilises sols: Brownian motion refers to the random movement of colloidal particles. This motion actually contributes to the stability of sols by preventing sedimentation, as the constant motion keeps the particles from settling. Therefore, this statement is incorrect.
Any amount of dispersed phase can be added to emulsion without destabilising it: In an emulsion, there is a limit to how much dispersed phase can be added. Adding more than the capacity of the continuous phase can indeed destabilize the emulsion, leading to separation. Thus, this statement is incorrect.
Mixing two oppositely charged sols in equal amount neutralises charges and stabilises colloids: When two oppositely charged sols are mixed, they can coagulate due to neutralization of charges, which often leads to destabilization rather than stabilization. Hence, this statement is incorrect.
Presence of equal and similar charges on colloidal particles provides stability to the colloidal solution: This is the correct statement. Colloidal particles having similar charges repel each other, which prevents them from coming together and settling down. This repulsion provides stability to the colloidal solution.

Based on the analysis, the correct answer is: Presence of equal and similar charges on colloidal particles provides stability to the colloidal solution. This is because like charges repel each other, preventing aggregation of particles, which enhances the stability of colloids.

List II	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.

Which of the following is a correct statement?

The Correct Option is D

Solution and Explanation

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