Question

A suspension shows rapid sedimentation due to particle size. Which unit operation before formulation would improve stability?

• A. Filtration
• B. Extraction
• C. Drying
• D. Size reduction

Hint:

Smaller particles settle more slowly, so size reduction helps improve suspension stability.

Answer 1

The Correct Option is D

Concept:
Suspension stability depends greatly on particle size. Larger particles settle faster than smaller particles.

Step 1: Understanding sedimentation.
Sedimentation is the settling of particles under the influence of gravity.

Step 2: Effect of particle size.
If particle size is large, the particles settle quickly. Reducing the particle size slows down sedimentation and improves uniformity.

Step 3: Role of size reduction.
Size reduction converts larger particles into smaller particles. This helps improve the physical stability of suspensions.

Step 4: Final answer.
Hence, size reduction before formulation improves suspension stability. \[ \boxed{\text{Size reduction}} \]