Question

Which one of the following method is commonly used method for destruction of colloid:

• A. Dialysis
• B. Condensation
• C. Filtration by animal membrane
• D. By adding electrolyte

Answer 1

The Correct Option is D

Colloids are mixtures where one substance of microscopically dispersed insoluble particles is suspended throughout another substance. The destruction or destabilization of colloids is an important process in various industrial and laboratory practices. One of the most common methods to achieve this is by adding an electrolyte.

1. Understanding the Colloid Structure:
   • Colloids consist of dispersed phase particles maintained in the dispersion medium by electrical charges, which result in mutual repulsion and prevent aggregation.
2. Role of Electrolytes:
   • An electrolyte, when added to a colloidal system, dissociates into ions.
   • These ions neutralize the charge on the colloidal particles.
   • Once the particles lose their charge, they can no longer repel each other and start to agglomerate, leading to coagulation or precipitation.
3. Why Other Methods Are Less Common for Destruction:
   • Dialysis: Primarily used for purification rather than destruction by removing ions that stabilize the colloids.
   • Condensation: It is a process to form colloids, not destroy them.
   • Filtration by animal membrane: Used for the separation of colloidal particles from soluble ions but not ideal for direct destabilization.
4. Conclusion:
   • The most effective and commonly used method for the destruction of colloids is by adding an electrolyte. This process is widely utilized due to its efficiency in neutralizing charge and promoting coagulation.