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 $\textless 1$ 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 (I, VI) = 2. Number of Macromolecular colloids (III, V, VII) = 3.
Step 3: Final Answer:
The respective numbers are 2 and 3.