Four metals and their methods of refinement are given
(i) `Ni,Cu,Zr,Ga`
(ii) Electrolysis, Val Arkel process, zone refining, Mond's process
Choose the right method for each :

Options

A. Ni : Electrolysis , Cu : van Arkel process,
Zr : Zone refining, Ga: Mond's process
B. Ni: Mond's refining ,Cu : Electrolysis ,
Zr: van Arkel process, Ga: Zone refining
C. Ni: Mond's process, Cu: van Arkel process,
Zr: Zone refining , Ga: Electrolysis
D. Ni : Electrolysis , Cu : Zone refining,
Zr: van Arkel process, Ga: Mond's process

Answer

To solve the question regarding the correct methods of refinement for the given metals, we will analyze each metal and its corresponding refining method step by step.

### Step-by-Step Solution:

1. **Identify the Metals and Their Refinement Methods:**
- The metals provided are: Nickel (Ni), Copper (Cu), Zirconium (Zr), and Gallium (Ga).
- The methods of refinement provided are: Electrolysis, Van Arkel process, Zone refining, and Mond's process.

2. **Determine the Refinement Method for Nickel (Ni):**
- Nickel is refined using the **Mond's process**. This process involves the formation of a volatile nickel carbonyl compound which is then decomposed to yield pure nickel.

3. **Determine the Refinement Method for Copper (Cu):**
- Copper is a highly electropositive element. The method used for refining copper is **Electrolysis**. In this method, copper is purified by dissolving impure copper in an electrolyte solution and then depositing pure copper on the cathode.

4. **Determine the Refinement Method for Zirconium (Zr):**
- Zirconium is refined using the **Van Arkel process**. This method involves the formation of a volatile compound of zirconium which is then decomposed to yield pure zirconium.

5. **Determine the Refinement Method for Gallium (Ga):**
- Gallium is a semiconductor, and the method used for its refinement is **Zone refining**. This technique is effective for purifying semiconductors by melting a small region of the material and moving it along the solid to remove impurities.

6. **Summarize the Results:**
- Nickel (Ni) - Mond's process
- Copper (Cu) - Electrolysis
- Zirconium (Zr) - Van Arkel process
- Gallium (Ga) - Zone refining

### Final Matching:
- Nickel: Mond's process
- Copper: Electrolysis
- Zirconium: Van Arkel process
- Gallium: Zone refining

### Conclusion:
The correct option that matches the metals with their refining methods is:
- Nickel by Mond's process
- Copper by Electrolysis
- Zirconium by Van Arkel process
- Gallium by Zone refining