Which product of coal is used as a reducing agent in the extraction of metals?

Options

A. Coke
B. Coal tar
C. Coal gas
D. Both A and B

Answer

To answer the question "Which product of coal is used as a reducing agent in the extraction of metals?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Products of Coal**:
Coal is processed to produce three main products: coke, coal tar, and coal gas.

2. **Understand the Role of Reducing Agents**:
A reducing agent is a substance that donates electrons to another substance, reducing its oxidation state. In metallurgy, reducing agents are used to extract metals from their ores.

3. **Examine Each Product**:
- **Coke**: This is a tough, porous black substance that is primarily composed of carbon. It is known for its high carbon content and is a very effective reducing agent.
- **Coal Tar**: This is a thick, black liquid that contains many organic compounds but is not typically used as a reducing agent.
- **Coal Gas**: This is a mixture of gases and is not used as a reducing agent in metal extraction.

4. **Conclude with the Correct Product**:
Among the three products of coal, **coke** is the one that is used as a reducing agent in the extraction of metals, particularly in the extraction of iron from its oxide in a blast furnace.

### Final Answer:
The product of coal that is used as a reducing agent in the extraction of metals is **coke**.

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