Question:
Statement of deflocculated suspension
Statement of deflocculated suspension
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Deflocculated suspensions have slow sedimentation but may cause caking, affecting formulation stability and patient acceptability.
Updated On: Jul 14, 2026
- Sedimentation for rapidly
- Sedimentation for slowly
- Easy to redisperse
- Unpleasant in appearance
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The Correct Option is B
Approach Solution - 1
A deflocculated suspension is one in which the particles remain as individual entities rather than forming loose aggregates or flocs. As a result, the particles settle slowly due to their small size and high surface area, causing sedimentation to occur slowly.
Characteristics of deflocculated suspensions include:
- Sedimentation occurs slowly because individual particles settle independently, often forming a compact, hard cake that is difficult to redisperse.
- They tend to have poor physical stability as sedimented particles pack tightly, leading to difficult redispersion.
- Appearance may be clear initially but becomes problematic upon settling.
In contrast, flocculated suspensions form loose aggregates (flocs) that settle rapidly but are easier to redisperse, preventing hard caking.
- They tend to have poor physical stability as sedimented particles pack tightly, leading to difficult redispersion.
- Appearance may be clear initially but becomes problematic upon settling.
In contrast, flocculated suspensions form loose aggregates (flocs) that settle rapidly but are easier to redisperse, preventing hard caking.
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Approach Solution -2
This question is testing the behavior of a deflocculated suspension, one where the particles are kept apart as individual units rather than loosely clumped together. Looking at what happens physically when particles settle one by one, instead of as clumps, points to the right description.
- Sedimentation for rapidly: Rapid sedimentation happens when particles clump together into flocs that are heavier and larger than single particles, so they fall through the liquid quickly. That describes a flocculated system, the opposite of a deflocculated one.
- Sedimentation for slowly: In a deflocculated suspension, each particle settles on its own, and small individual particles fall through a liquid far more slowly than large flocs do, following Stokes' law where settling rate depends on particle size. This slow, particle-by-particle settling is the defining behavior of a deflocculated system.
- Easy to redisperse: This describes the opposite outcome. Because deflocculated particles pack down tightly into a compact cake as they settle slowly, that cake resists breaking up again on shaking and is actually hard to redisperse.
- Unpleasant in appearance: A deflocculated suspension often looks acceptable while it is settling since the supernatant stays relatively clear for a while, so appearance alone does not define this type of system.
The defining physical trait of a deflocculated suspension is that its individual, unaggregated particles take a long time to settle out of the liquid.
So the correct answer is sedimentation for slowly.
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