Question

Observe the following colloids:
I. Gold
II. Detergent
III. Starch
IV. Soap
V. Synthetic rubber
VI. Sulphur
VII. Cellulose
The number of multimolecular colloids and macromolecular colloids in the above list is respectively

• A. 2, 3
• B. 1, 3
• C. 3, 4
• D. 4, 3

Hint:

Think of Macromolecules as "one giant molecule" (Polymer). Think of Multimolecular as "many small molecules/atoms clustered" ($S_8$, Au).

Answer 1

The Correct Option is A

Step 1: Classify each colloid:
 

• Multimolecular Colloids: Formed by aggregation of many small atoms or molecules (diameter $< 1\,\text{nm}$).
  • Examples from list: Gold sol (I), Sulphur sol (VI).
• Macromolecular Colloids: Formed by large molecules (polymers) having colloidal dimensions.
  • Examples from list: Starch (III), Synthetic rubber (V), Cellulose (VII).
• Associated Colloids (Micelles): Aggregates formed at higher concentrations.
  • Examples from list: Detergent (II), Soap (IV).

Step 2: Count the numbers:
Number of Multimolecular colloids = $2$ (I, VI)
Number of Macromolecular colloids = $3$ (III, V, VII) 

Step 3: Final Answer:
The respective numbers are $2$ and $3$.