Choose the incorrect methods for each:

Options

A. `Ni`: electrolysis process, `Cu`: van Arkel process, `Zn`: refinining, `Ga`: zone refining
B. `Ni`: mond's process, `Cu`: electrolysis, `Zr`: van Arkel process, `Ga`: zone refining
C. `Ni`: electrolysis process, `Cu`: zone refining, `Zr`: van Arkel process, `Ga`: electrolysis
D. `Ni`: electrolysis process, `Cu`: zone refining, `Zr`: van Arkel process, `Ga`: mond's process

Explanation

To solve the question of identifying the incorrect methods for the purification of metals, we will analyze each metal and its corresponding purification method based on the provided information.

### Step-by-Step Solution:

1. **Identify the Metals and Their Purification Methods:**
- **Nickel**: The method used is the **Mons process**.
- **Copper**: The method used is **Electrolysis**.
- **Zirconium**: The method used is the **Van Arkel method**.
- **Gallium**: The method used is **Zone refining**.

2. **Evaluate Each Method:**
- **Nickel (Mons Process)**: This method is correct. The Mons process involves heating impure nickel with carbon monoxide to form nickel carbonyl, which is then decomposed to yield pure nickel.
- **Copper (Electrolysis)**: This method is also correct. Electrolysis involves using impure copper as the anode and pure copper as the cathode, where copper ions are deposited onto the cathode.
- **Zirconium (Van Arkel Method)**: This method is correct as well. The Van Arkel method involves heating zirconium with iodine to form a volatile complex, which decomposes to yield pure zirconium.
- **Gallium (Zone Refining)**: This method is correct. Zone refining is a technique used to purify gallium by melting impurities at a specific zone.

3. **Conclusion on Incorrect Methods**:
- Since all the methods listed (Mons process for nickel, electrolysis for copper, Van Arkel method for zirconium, and zone refining for gallium) are indeed correct, there are no incorrect methods among the options provided.
- Therefore, the answer to the question of which methods are incorrect is that there are no incorrect methods listed.

### Final Answer:
- **Incorrect methods for each metal**: None of the methods listed (A, B, C, D) are incorrect.