Which of the following is correct ?

Options

A. Adsorption is always oxothermic
B. Adsorpton is always endothermic
C. Physical adsorption is endothermic whereas chamisorption is exothermic
D. Chemical adsorptin is exothermic whereas physical adsorption is endothermic.

Explanation

To determine which statement about adsorption is correct, we need to analyze the options provided.

### Step-by-Step Solution:

1. **Understanding Adsorption**:
- Adsorption is the process by which atoms, ions, or molecules from a gas, liquid, or dissolved solid adhere to a surface.
- There are two main types of adsorption: physical (physisorption) and chemical (chemisorption).

2. **Analyzing the Options**:
- **Option 1**: "Adsorption is always exothermic."
- This statement is generally true. Most adsorption processes release energy, indicating that they are exothermic.

- **Option 2**: "Adsorption is always endothermic."
- This statement is incorrect. While some specific cases might be endothermic, the majority of adsorption processes are exothermic.

- **Option 3**: "Physical adsorption is endothermic whereas chemisorption is exothermic."
- This statement is misleading. Physical adsorption is typically exothermic as well, although it may involve lower energy changes compared to chemisorption.

- **Option 4**: "Chemical adsorption is exothermic whereas physical adsorption is exothermic."
- This statement is incorrect because it implies that physical adsorption is also exothermic, which is not universally true.

3. **Conclusion**:
- After analyzing all options, **Option 1** is the correct answer: "Adsorption is always exothermic."

### Final Answer:
The correct option is **Option 1: Adsorption is always exothermic.**