Consider the following metallurgical processes :
(1) Heating impure metal with `CO` and distilling the resulting volatile carbonyl `(BP 43^@ C)` and finally decomposing at `150^@C` to `230^@ C` to get pure metal.
(2) Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged sulphide.
(3) Electrolysing the molten electrolyte containing `CaCl_(2)` to obtain the metal
The processes used for obtaining sodium, nickel, and copper are, respectively

Options

A. 1,2 and 3
B. 2,3 and 1
C. 3,1 and 2
D. 2,1 and 3

Answer

To solve the question regarding the metallurgical processes used for obtaining sodium, nickel, and copper, we will analyze each process step by step.

### Step 1: Identify the processes

1. **Heating impure metal with CO and distilling the resulting volatile carbonyl (BP 43°C) and finally decomposing at 150°C to 230°C to get pure metal.**
- This process is known as the carbonyl process, which is specifically used for nickel extraction.

2. **Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged sulphide.**
- This describes the roasting of copper sulfide ores, which is a method used to extract copper.

3. **Electrolyzing the molten electrolyte containing CaCl₂ to obtain the metal.**
- This process refers to the Down's process, which is used for the extraction of sodium.

### Step 2: Match the processes with the metals

- **Sodium:** The process used is the third one (Electrolysis of molten CaCl₂).
- **Nickel:** The process used is the first one (Heating with CO and carbonyl distillation).
- **Copper:** The process used is the second one (Roasting of sulfide ore).

### Step 3: Conclusion

Based on the analysis, the processes used for obtaining sodium, nickel, and copper are, respectively:
- Sodium: **3**
- Nickel: **1**
- Copper: **2**

Thus, the correct answer is **3, 1, 2**.