Which of the following statements does not show correct difference between adsorption and adsorption ?

Options

A. In adsorption , the substance is concentrated only at the surface while in absorption it is uniformaly distributed in the bulk.
B. Adsorption is instantaneous while absorption is a slow process.
C. A substance can be adsorbed as well as absorbed simultaneously and the process is called sorption.
D. Only gases are adsorbed while solids and liquids are absorbed.

Explanation

To solve the question regarding the differences between adsorption and absorption, let's analyze each statement provided and determine which one does not correctly describe the differences between the two processes.

### Step-by-Step Solution:

1. **Understanding Adsorption and Absorption**:
- **Adsorption** is the process where molecules adhere to the surface of a solid or liquid, leading to a higher concentration at the surface compared to the bulk.
- **Absorption** is the process where a substance is taken up into the bulk of another material, resulting in a uniform distribution throughout.

2. **Analyzing the Statements**:
- **Statement 1**: "In adsorption, the substance is concentrated only at the surface while in absorption, it is uniformly distributed in the bulk."
- This statement is **correct**. Adsorption occurs at the surface, while absorption involves the entire volume.

- **Statement 2**: "Adsorption is instantaneous while absorption is a slow process."
- This statement is also **correct**. Adsorption happens quickly at the surface, while absorption takes time as it involves the bulk material.

- **Statement 3**: "A substance can be absorbed as well as adsorbed simultaneously and the process is called sorption."
- This statement is **correct**. The term "sorption" encompasses both adsorption and absorption occurring together.

- **Statement 4**: "Only gases are absorbed while solids and liquids are adsorbed."
- This statement is **incorrect**. In adsorption, gases, liquids, and solids can all be adsorbed onto surfaces. Absorption can also occur with gases, liquids, and solids.

3. **Conclusion**:
- The statement that does not show the correct difference between adsorption and absorption is **Statement 4**.

### Final Answer:
The statement that does not show the correct difference between adsorption and absorption is **Statement 4**.