Question:
Identify the incorrect statement about colloidal solution.
Identify the incorrect statement about colloidal solution.
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True solutions show larger colligative effects than colloidal solutions because they contain a much greater number of solute particles.
Updated On: Jun 18, 2026
- They scatter light
- The diameter range of colloidal particles is 1–1000 nm
- Elevation in boiling point of a colloidal solution is greater than the true solution of same concentration
- \(As_2S_3\) and CdS sols are negatively charged
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The Correct Option is C
Solution and Explanation
Concept:
Colligative properties depend on the number of particles present in solution.
Step 1: Check statement A.
Colloids show Tyndall effect. Hence they scatter light. Correct.
Step 2: Check statement B.
Colloidal particles generally have sizes between \[ 1nm-1000nm \] Correct.
Step 3: Check statement D.
\[ As_2S_3 \] and \[ CdS \] sols are negatively charged. Correct.
Step 4: Check statement C.
Colloidal solutions contain comparatively fewer particles than true solutions of the same concentration. Therefore colligative effects such as elevation in boiling point are smaller, not greater. Hence statement C is incorrect. \[ \boxed{\text{Option (C)}} \]
Step 1: Check statement A.
Colloids show Tyndall effect. Hence they scatter light. Correct.
Step 2: Check statement B.
Colloidal particles generally have sizes between \[ 1nm-1000nm \] Correct.
Step 3: Check statement D.
\[ As_2S_3 \] and \[ CdS \] sols are negatively charged. Correct.
Step 4: Check statement C.
Colloidal solutions contain comparatively fewer particles than true solutions of the same concentration. Therefore colligative effects such as elevation in boiling point are smaller, not greater. Hence statement C is incorrect. \[ \boxed{\text{Option (C)}} \]
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