Question:
Which of the following methods are used for the coagulation of lyophobic colloidal solutions?
I. Cooling
II. Electrophoresis
III. Mixing two oppositely charged sols
IV. Dialysis for short duration
Which of the following methods are used for the coagulation of lyophobic colloidal solutions?
I. Cooling
II. Electrophoresis
III. Mixing two oppositely charged sols
IV. Dialysis for short duration
I. Cooling
II. Electrophoresis
III. Mixing two oppositely charged sols
IV. Dialysis for short duration
Show Hint
Coagulation occurs by neutralization of charge on colloidal particles.
Updated On: Jun 20, 2026
- I, II
- II, III
- III, IV
- II, IV
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understand coagulation of lyophobic sols.
Coagulation is the process of destabilization of colloidal particles leading to aggregation and precipitation. It generally occurs by removing charge stabilization.
Step 2: Analyze electrophoresis (II).
In electrophoresis, colloidal particles move under electric field and are discharged at electrodes, leading to neutralization and coagulation. Hence it is a valid method.
Step 3: Analyze mixing oppositely charged sols (III).
When positively and negatively charged sols are mixed, charge neutralization occurs, causing aggregation and precipitation. This is called mutual coagulation.
Step 4: Analyze cooling (I).
Cooling mainly affects solubility and stability but is not a standard method for coagulation of lyophobic sols. Hence incorrect here.
Step 5: Analyze dialysis (IV).
Dialysis is used for purification of sols by removing ions, not for coagulation. So it is also incorrect.
Step 6: Final conclusion.
Only electrophoresis and mixing of oppositely charged sols are valid coagulation methods.
Final Answer: \[ \boxed{\text{II, III}} \]
Coagulation is the process of destabilization of colloidal particles leading to aggregation and precipitation. It generally occurs by removing charge stabilization.
Step 2: Analyze electrophoresis (II).
In electrophoresis, colloidal particles move under electric field and are discharged at electrodes, leading to neutralization and coagulation. Hence it is a valid method.
Step 3: Analyze mixing oppositely charged sols (III).
When positively and negatively charged sols are mixed, charge neutralization occurs, causing aggregation and precipitation. This is called mutual coagulation.
Step 4: Analyze cooling (I).
Cooling mainly affects solubility and stability but is not a standard method for coagulation of lyophobic sols. Hence incorrect here.
Step 5: Analyze dialysis (IV).
Dialysis is used for purification of sols by removing ions, not for coagulation. So it is also incorrect.
Step 6: Final conclusion.
Only electrophoresis and mixing of oppositely charged sols are valid coagulation methods.
Final Answer: \[ \boxed{\text{II, III}} \]
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