Question

Which from following process does NOT results in coagulation?

• A. electrophoresis
• B. by adding excess solvent
• C. by mixing two oppositely charged sols
• D. by boiling

Hint:

Electrophoresis is used to study movement of colloidal particles in electric field, while coagulation means actual aggregation and precipitation of particles.

Answer 1

The Correct Option is A

Concept:
Coagulation means precipitation or aggregation of colloidal particles. It can be caused by heating, mixing oppositely charged sols, or adding electrolytes. ip

Step 1: Check processes that cause coagulation.

• Boiling can reduce stability and cause coagulation.
• Mixing oppositely charged sols causes mutual neutralization and coagulation.
• Addition of certain agents or changes in medium can lead to coagulation. e} ip

Step 2: Check electrophoresis.
Electrophoresis is the movement of colloidal particles in an electric field. It is mainly used to show the charge on colloidal particles and does not itself represent coagulation. ip Hence, the correct answer is:
\[ \boxed{(A)\ \text{electrophoresis}} \]