Which of the following is a correct statement?
- (A)Brownian motion destabilises sols.
- (B)Any amount of dispersed phase can be added to emulsion without destabilising 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.✓ Correct
Answer: (D)
Solution
Analyzing each statement:
(A) Brownian motion actually stabilizes sols by preventing sedimentation due to gravity. Incorrect.
(B) Emulsions have a limited capacity; adding excess dispersed phase can destabilize them. Incorrect.
(C) Mixing oppositely charged sols causes neutralization and coagulation (destabilization), not stabilization. Incorrect.
(D) When colloidal particles carry equal and similar charges, they repel each other electrostatically. This repulsion prevents aggregation and precipitation, thereby providing stability to the colloidal solution. Correct.
Answer: (D)
(A) Brownian motion actually stabilizes sols by preventing sedimentation due to gravity. Incorrect.
(B) Emulsions have a limited capacity; adding excess dispersed phase can destabilize them. Incorrect.
(C) Mixing oppositely charged sols causes neutralization and coagulation (destabilization), not stabilization. Incorrect.
(D) When colloidal particles carry equal and similar charges, they repel each other electrostatically. This repulsion prevents aggregation and precipitation, thereby providing stability to the colloidal solution. Correct.
Answer: (D)
JEE Main · 2022 · 29 Jun 2022 · Shift 1 · Single correct option