In the adsorption of oxalic acid by activated charcoal, the activated charcoal is known as:

Options

A. adsorbent
B. adsorbate
C. absorber
D. absoibate

Explanation

To solve the question regarding the adsorption of oxalic acid by activated charcoal, we need to understand the definitions of the terms involved in the process of adsorption.

### 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. This creates a film of the adsorbate on the surface of the adsorbent.

2. **Identifying the Terms**:
- **Adsorbent**: This is the substance that provides the surface for adsorption. It is the material on which the adsorption occurs.
- **Adsorbate**: This is the substance that is being adsorbed onto the surface of the adsorbent.

3. **Applying Definitions to the Question**:
- In the case of the adsorption of oxalic acid by activated charcoal:
- The **activated charcoal** is the material that provides the surface for the adsorption process.
- The **oxalic acid** is the substance that is being adsorbed onto the activated charcoal.

4. **Conclusion**:
- Therefore, in the adsorption of oxalic acid by activated charcoal, the activated charcoal is known as the **adsorbent**.

### Final Answer:
Activated charcoal is known as the **adsorbent** in the adsorption of oxalic acid.

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