Question:
Which of the following can form a colloidal sol with water?
Which of the following can form a colloidal sol with water?
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Macromolecules like starch, gelatin, and proteins usually form colloidal solutions in water.
Updated On: Jan 26, 2026
- Common salt
- Starch
- Glucose
- Ammonium sulphate
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The Correct Option is B
Solution and Explanation
Step 1: Define colloidal sol.
A colloidal sol is a heterogeneous system in which particle size lies between true solutions and suspensions, typically \(1\text{ nm} - 1000\text{ nm}\).
Step 2: Analyze the given substances.
Common salt, glucose, and ammonium sulphate dissolve completely in water forming true solutions.
Step 3: Identify colloid-forming substance.
Starch does not dissolve completely in water; instead, it forms a colloidal sol due to its large molecular size.
Step 4: Conclusion.
Therefore, starch forms a colloidal sol with water.
A colloidal sol is a heterogeneous system in which particle size lies between true solutions and suspensions, typically \(1\text{ nm} - 1000\text{ nm}\).
Step 2: Analyze the given substances.
Common salt, glucose, and ammonium sulphate dissolve completely in water forming true solutions.
Step 3: Identify colloid-forming substance.
Starch does not dissolve completely in water; instead, it forms a colloidal sol due to its large molecular size.
Step 4: Conclusion.
Therefore, starch forms a colloidal sol with water.
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