Adsorption is a process in which a substance accumulates on the ……………… of the other substance.

Options

A. Accumulates on the surface of other substance
B. Goes into the body of the other substance
C. Remains close to the other substnace
D. None is correct

Answer

To solve the question regarding the process of adsorption, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Adsorption**:
- Adsorption is a process where molecules of a substance (adsorbate) accumulate on the surface of another substance (adsorbent).

2. **Differentiate Between Adsorption and Absorption**:
- It is important to distinguish between adsorption and absorption.
- Adsorption is a surface phenomenon, meaning that the adsorbate only accumulates on the surface of the adsorbent.
- Absorption, on the other hand, involves the entire volume of the material, where the substance penetrates into the bulk of the adsorbent.

3. **Identify the Key Term for the Blank**:
- Given the definition of adsorption, the key term that fits in the blank is "surface".
- Therefore, the complete statement would read: "Adsorption is a process in which a substance accumulates on the surface of the other substance."

4. **Select the Correct Option**:
- Based on the understanding that adsorption occurs on the surface, the correct option for the fill-in-the-blank question is "surface".

### Final Answer:
Adsorption is a process in which a substance accumulates on the **surface** of the other substance.