Gallium arsenide is purified by _________.

Options

A. van-Arkel method
B. Zone-refining method
C. Electrolytic method
D. Liquation

Answer

To answer the question "Gallium arsenide is purified by _________," we will analyze the purification methods provided in the options and determine the correct one.

### Step-by-Step Solution:

1. **Understanding the Purification Methods**:
- **A. Van Arkel's Method**: This method is primarily used for metals that easily vaporize, such as titanium and zirconium. It is not suitable for gallium arsenide.

- **B. Zone Refining Method**: This method is effective for purifying metals to a high degree of purity. In this process, a narrow molten zone is created in a solid rod of the material, and as the zone moves along the rod, pure metal crystallizes out while impurities are left behind. This method is particularly useful for semiconductors like gallium arsenide.

- **C. Electrolytic Method**: This method involves the use of electrodes and is generally more costly. It is not commonly used for gallium arsenide purification.

- **D. Diesel Equation**: This option does not relate to any known purification method for gallium arsenide.

2. **Identifying the Correct Method**:
- Given the analysis, the **Zone Refining Method** is specifically mentioned as suitable for purifying semiconductors, including gallium arsenide.

3. **Conclusion**:
- Therefore, the correct answer to the question is **B. Zone refining method**.

### Final Answer:
Gallium arsenide is purified by **Zone refining method**.