Question:
Which among the following is a multi-molecular colloid?
Which among the following is a multi-molecular colloid?
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Keep this simple trick in mind: Elemental sols (like Gold, Platinum, or Sulfur) are always multi-molecular aggregates, polymers are macromolecular, and detergents/soaps are associated systems!
Updated On: Jun 3, 2026
- Nylon
- Gold sol
- Cellulose
- Soap
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
We need to identify which of the given materials forms a multi-molecular colloidal system when dispersed in an appropriate medium.
Step 2: Detailed Explanation:
Colloidal solutions are classified into three types based on the structural characteristics of the dispersed particles:
• Multi-molecular Colloids: Formed when a large number of small atoms or smaller molecules (diameter $< 1\ \text{nm}$) aggregate together to form species having dimensions in the colloidal range ($1 - 1000\ \text{nm}$). A classic example is a gold sol, where colloidal particles consist of clusters of several thousands of gold atoms. Sulfur sol ($\text{S}_8$ clusters) also fits this category.
• Macromolecular Colloids: Formed when large polymeric molecules (macromolecules) dissolve in a solvent. Synthetic polymers like Nylon and natural polymers like Cellulose fall under this classification because individual molecules are already in the colloidal size range.
• Associated Colloids (Micelles): Formed by substances that behave as normal strong electrolytes at low concentrations, but aggregate to form colloidal micelles at higher concentrations. Soap is a classic example of an associated colloid.
Step 3: Final Answer: The multi-molecular colloid among the choices is Gold sol, matching option (B).
We need to identify which of the given materials forms a multi-molecular colloidal system when dispersed in an appropriate medium.
Step 2: Detailed Explanation:
Colloidal solutions are classified into three types based on the structural characteristics of the dispersed particles:
• Multi-molecular Colloids: Formed when a large number of small atoms or smaller molecules (diameter $< 1\ \text{nm}$) aggregate together to form species having dimensions in the colloidal range ($1 - 1000\ \text{nm}$). A classic example is a gold sol, where colloidal particles consist of clusters of several thousands of gold atoms. Sulfur sol ($\text{S}_8$ clusters) also fits this category.
• Macromolecular Colloids: Formed when large polymeric molecules (macromolecules) dissolve in a solvent. Synthetic polymers like Nylon and natural polymers like Cellulose fall under this classification because individual molecules are already in the colloidal size range.
• Associated Colloids (Micelles): Formed by substances that behave as normal strong electrolytes at low concentrations, but aggregate to form colloidal micelles at higher concentrations. Soap is a classic example of an associated colloid.
Step 3: Final Answer: The multi-molecular colloid among the choices is Gold sol, matching option (B).
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