The substance used as a adsorbentt in the column

Options

A. `Na_(2)O`
B. `Na_(2)SO_(4)`
C. `Al_(2)O_(3)`
D. alum.

Answer

To solve the question regarding the substance used as an adsorbent in column chromatography, we will analyze the options provided: sodium oxide, sodium sulfate, and aluminum oxide.

### Step-by-Step Solution:

1. **Understanding Column Chromatography**:
- Column chromatography is a technique used to separate mixtures based on their different affinities towards a stationary phase and a mobile phase.
- The stationary phase is typically a solid material, while the mobile phase is a liquid solvent.

2. **Identifying the Stationary Phase**:
- The stationary phase in column chromatography is crucial as it interacts with the components of the mixture.
- Common adsorbents used as stationary phases include silica gel, alumina (Al2O3), calcium carbonate, and calcium phosphate.

3. **Analyzing the Options**:
- **Sodium Oxide (Na2O)**: This is not commonly used as an adsorbent in chromatography.
- **Sodium Sulfate (Na2SO4)**: While it is a drying agent, it is not typically used as an adsorbent in column chromatography.
- **Aluminum Oxide (Al2O3)**: This is a well-known adsorbent used in column chromatography. It has a high surface area and is effective in separating compounds based on their polarity.

4. **Conclusion**:
- Among the options provided, aluminum oxide (Al2O3) is the correct choice as it is widely recognized as an effective adsorbent in column chromatography.

### Final Answer:
The substance used as an adsorbent in the column is **Aluminum Oxide (Al2O3)**.

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