Question:
Which of the following compounds forms a colloidal solution when dissolved in water?
Which of the following compounds forms a colloidal solution when dissolved in water?
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Starch forms a colloidal solution in water, making it useful in food and industrial applications.
Updated On: Feb 9, 2026
- Glucose
- Ammonium chloride
- Common salt
- Starch
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The Correct Option is D
Solution and Explanation
Step 1: Understanding colloidal solutions.
A colloidal solution is a mixture where one substance is dispersed in another but does not dissolve completely. Starch, when dissolved in water, forms a colloidal solution. It does not form a true solution but instead creates a colloidal suspension.
Step 2: Analyzing the options.
(A) Glucose: Incorrect. Glucose dissolves in water to form a true solution, not a colloidal one.
(B) Ammonium chloride: Incorrect. Ammonium chloride dissolves completely in water, forming a true solution.
(C) Common salt: Incorrect. Like ammonium chloride, common salt dissolves completely in water to form a true solution.
(D) Starch: Correct. Starch forms a colloidal solution when dissolved in water due to its ability to form a gel-like suspension.
Step 3: Conclusion.
The correct answer is (D) Starch, as it forms a colloidal solution when dissolved in water.
A colloidal solution is a mixture where one substance is dispersed in another but does not dissolve completely. Starch, when dissolved in water, forms a colloidal solution. It does not form a true solution but instead creates a colloidal suspension.
Step 2: Analyzing the options.
(A) Glucose: Incorrect. Glucose dissolves in water to form a true solution, not a colloidal one.
(B) Ammonium chloride: Incorrect. Ammonium chloride dissolves completely in water, forming a true solution.
(C) Common salt: Incorrect. Like ammonium chloride, common salt dissolves completely in water to form a true solution.
(D) Starch: Correct. Starch forms a colloidal solution when dissolved in water due to its ability to form a gel-like suspension.
Step 3: Conclusion.
The correct answer is (D) Starch, as it forms a colloidal solution when dissolved in water.
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