Answer the following questions given below:
A water purification and testing laboratory receives two different samples:
Sample A: Highly turbid river water containing extremely fine clay particles that do not settle even after long standing. The technician adds alum and observes formation of flocs which slowly settle down.
Sample B: A blood sample collected for medical analysis. The sample is placed in a centrifuge machine and spun at high speed, resulting in separation of plasma, white blood cells, and red blood cells.
The scientist explains that different separation techniques are chosen based on particle size, stability, and density differences
1. Why is coagulation used for Sample A instead of direct filtration?
2. What would happen if coagulation is applied to blood instead of centrifugation?
3. What is the role of alum in Sample A?
4. In Sample A, what is the main limitation of filtration alone?