The material mixed before ore is subjected for smelting in the extraction of iron are :

Options

A. coke and silica
B. coke and limestone
C. limestone and silica
D. coke, limestone and silica

Answer

To answer the question about the materials mixed before the ore is subjected to smelting in the extraction of iron, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Smelting**: Smelting is a process that involves heating ore to extract a base metal. In the case of iron extraction, we need to understand what materials are necessary for this process.

2. **Identifying the Role of Materials**: In the smelting process, two key types of materials are typically added:
- **Reducing Agent**: This is a substance that helps in reducing the metal oxide to metal. For iron extraction, coke is commonly used as the reducing agent.
- **Flux**: This is a substance that helps in removing impurities (gangue) from the ore. Limestone is often used as a flux in the smelting of iron.

3. **Combining the Materials**: Before the ore is subjected to smelting, coke and limestone are mixed with the iron ore. The coke serves to reduce the iron oxide to iron, while the limestone helps to form slag by combining with the impurities.

4. **Conclusion**: Therefore, the materials mixed before the ore is subjected to smelting in the extraction of iron are **coke and limestone**.

### Final Answer:
The correct answer is **coke and limestone**.

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