In purification of bauxite ore, it is mixed with coke and heated at `1800^(@)C` in presence of nitrogen, this is `:`

Options

A. Hall's Process
B. Serpeck's Process
C. Baeyer's Process
D. Electrolytic Reduction

Explanation

To solve the question regarding the purification of bauxite ore, we need to analyze the process described and identify which metallurgical process it corresponds to. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Composition of Bauxite
Bauxite is primarily composed of aluminum oxide (Al₂O₃) along with impurities such as silica (SiO₂) and iron oxides. The goal of purification is to extract pure aluminum oxide from bauxite.

**Hint:** Remember that bauxite contains aluminum oxide and various impurities that need to be removed.

### Step 2: Identify the Heating Process
The question states that bauxite ore is mixed with coke and heated at `1800°C` in the presence of nitrogen. This high-temperature treatment is typically aimed at reducing the impurities.

**Hint:** High temperatures are often used in metallurgical processes to facilitate reactions that remove impurities.

### Step 3: Analyze the Role of Coke and Nitrogen
Coke is a carbon-rich material that acts as a reducing agent. When heated with bauxite, it helps to reduce the silica impurities (SiO₂) to form silicon carbide (SiC) and other compounds, while nitrogen serves to create an inert atmosphere to prevent unwanted reactions.

**Hint:** Consider what happens to silica when it is heated with carbon in the presence of nitrogen.

### Step 4: Identify the Correct Process
The process described matches the **Serpeck process**, which is specifically used for the purification of bauxite. In this process, bauxite is treated with coke at high temperatures to remove silica impurities, yielding a purer form of aluminum oxide.

**Hint:** Recall that the Serpeck process is characterized by the use of coke and high temperatures to purify bauxite.

### Step 5: Eliminate Other Processes
- **Hall's Process**: Involves the electrolysis of aluminum oxide dissolved in cryolite, not heating with coke.
- **Bayer's Process**: Involves the treatment of bauxite with sodium hydroxide at lower temperatures (150-200°C) to form sodium aluminate, which is not what is described.
- **Electrolytic Reduction**: This refers to the process of reducing aluminum oxide to aluminum metal, not the purification of bauxite.

**Hint:** Compare the characteristics of each process to the description given in the question.

### Conclusion
The correct answer to the question is that the process described (mixing bauxite with coke and heating at `1800°C` in the presence of nitrogen) is the **Serpeck process**.

**Final Answer:** The process is the Serpeck process.