A Substance which reacts with gangue to form fusible material is called

Options

A. Flux
B. Catalyst
C. Ore
D. Siag

Answer

To solve the question, "A substance which reacts with gangue to form fusible material is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Gangue**:
- Gangue refers to the impurities or the worthless material that is found alongside the desired mineral in ore. It is typically in powdered form after the ore is crushed.

2. **Role of Flux**:
- A flux is a substance that is added to the gangue during the metallurgical process. Its primary purpose is to react with the gangue to help separate the desired metal from the impurities.

3. **Formation of Fusible Material**:
- When flux is added to the gangue, it reacts chemically with the impurities. This reaction produces a fusible material, which is typically in a molten state.

4. **Definition of Slag**:
- The fusible material formed from the reaction of flux and gangue is known as slag. Slag is a byproduct that can be removed easily from the metal during the extraction process.

5. **Common Examples of Flux**:
- One of the most common fluxes used in metallurgy is calcium oxide (CaO), which helps in forming the slag.

6. **Conclusion**:
- Therefore, the substance that reacts with gangue to form a fusible material is called **flux**.

### Final Answer:
The substance which reacts with gangue to form fusible material is called **flux**.

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