The extraction of metals from sulphide ore involves

Options

A. Reduction with carbon
B. Froth flotation
C. Reduction with `Al`
D. Electrolytic reduction

Answer

### Step-by-Step Text Solution:

1. **Concentration of Sulphide Ore**:
The first step in the extraction of metals from sulphide ores is the concentration of the ore. This is typically achieved through a process known as froth flotation. In this process, the sulphide ore is mixed with water and chemicals to create a frothy layer that separates the ore from earthy impurities.

2. **Roasting of Concentrated Ore**:
After the concentration process, the next step is roasting. This involves heating the concentrated sulphide ore in the presence of oxygen at high temperatures, but below the melting point of the ore. The purpose of roasting is to convert the sulphide into an oxide form. For example, if the ore is zinc sulphide (ZnS), it will be converted to zinc oxide (ZnO) during roasting.

3. **Reduction of Oxide Ore**:
The final step in the extraction process is the reduction of the oxide ore to obtain the pure metal. This is typically done by treating the oxide with a reducing agent, such as carbon (in the form of coke). The reduction process involves removing the oxygen from the oxide to yield the metal. For instance, zinc oxide can be reduced to zinc metal by heating it with carbon.

4. **Extraction of Metal**:
Once the reduction is complete, the metal is extracted in its elemental form. This metal can then be further purified if necessary, depending on the desired quality and application.

### Summary of the Process:
- Concentration of sulphide ore (Froth flotation)
- Roasting of concentrated ore (Conversion to oxide)
- Reduction of oxide ore (Using carbon)
- Extraction of pure metal

---