A chemist studied the phenomenon of adsorption by putting blood charcoal in `KCL` solution. He observed difference in the behaviour with dilute `KCL` solution and with concentrated `KCL` solution. He also studied the adsorption of different gases on solid adsorbent and the effect of temperature on adsorption. He put forward a mathematical relationship relating `x//m` with equilibrium pressure.
Which of the following result is oberved with the experiment of `KCl` solution ?

Options

A. Dilute `KCl` solution shows no adsorption whereas concentrated `KCl` shows adsorption
B. Concentrated `KCl` solution shows positive adsorption whereas dilute `KCl` solution shows negative adsorption.
C. Concentrated `KCl` solution shows positive adsorption whereas dilute shows negative adsorption.
D. Dilute `KCl` solution shows positive adsorption whereas concentrated `KCl` solution shows negative adsorption.

Explanation

To solve the question regarding the chemist's observations with blood charcoal in KCl solution, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Adsorption**:
- Adsorption is the process where molecules from a gas or liquid adhere to the surface of a solid or liquid. There are two types of adsorption: positive and negative.
- **Positive Adsorption**: This occurs when the concentration of the adsorbate (the substance being adsorbed) is higher on the surface of the adsorbent than in the bulk solution.
- **Negative Adsorption**: This occurs when the concentration of the adsorbate is lower on the surface of the adsorbent than in the bulk solution.

2. **Analyzing the KCl Solutions**:
- The chemist studied both dilute and concentrated KCl solutions.
- In **concentrated KCl solution**, the concentration of KCl is high. Therefore, the amount of KCl adsorbed on the surface of the blood charcoal will also be high, leading to **positive adsorption**.
- In **dilute KCl solution**, the concentration of KCl is low compared to water. Here, the amount of KCl adsorbed on the surface will be less than that in the bulk solution, leading to **negative adsorption**.

3. **Conclusion**:
- Based on the observations, the chemist would conclude that:
- Concentrated KCl solution shows **positive adsorption**.
- Dilute KCl solution shows **negative adsorption**.

4. **Final Answer**:
- The result observed with the experiment of KCl solution is that concentrated KCl shows positive adsorption, while dilute KCl shows negative adsorption.