A dense solution of CsCl,on centrifugation forms density bands of a solution of

Options

A. Lower density at the bottom
B. Lower density at the top
C. Higher density at the top
D. Medium density at extreme bottom

Answer

To solve the question regarding the density bands formed by a dense solution of CsCl upon centrifugation, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding Centrifugation**:
Centrifugation is a process that uses centrifugal force to separate components of a mixture based on their density. When a solution is centrifuged, the denser components move towards the bottom of the container, while the less dense components remain at the top.

**Hint**: Remember that in centrifugation, denser substances settle at the bottom.

2. **Identifying the Components**:
In a dense solution of CsCl, the components will separate into three distinct layers based on their densities:
- The **heaviest (highest density)** component will settle at the bottom.
- The **medium density** component will be in the middle.
- The **lightest (lowest density)** component will float at the top.

**Hint**: Think about how weight affects the position of substances in a centrifuge.

3. **Analyzing the Density Bands**:
- **Bottom Layer**: This layer will contain the highest density substances, which in this case would be the CsCl solution.
- **Middle Layer**: This layer will contain substances of medium density.
- **Top Layer**: This layer will contain the lowest density substances.

**Hint**: Visualize the layers in terms of density - heavier at the bottom, lighter at the top.

4. **Selecting the Correct Option**:
Based on the analysis:
- The lowest density is at the top.
- The medium density is in the middle.
- The highest density is at the bottom.

Therefore, the correct option is the one that states: "Lower density at the top, medium density in the middle, and higher density at the bottom."

**Hint**: Look for the option that correctly describes the arrangement of densities after centrifugation.

### Conclusion:
The correct answer is that a dense solution of CsCl upon centrifugation forms density bands with the lowest density at the top, medium density in the middle, and the highest density at the bottom.