Name the flux to remove the impurity of `SiO_(2)`

Options

A. `P_(4)O_(10)`
B. `CaO`
C. `N_(2)O_(5)`
D. `Al_(2)O_(3)`

Explanation

To solve the question of naming the flux that removes the impurity of SiO₂, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Flux**:
- Flux is a substance that is added during the metallurgical process to combine with impurities (gangue) present in the ore. It helps in forming a slag, which is a fusible material that can be easily removed.

2. **Identify the Impurity**:
- In this case, the impurity we are dealing with is silicon dioxide (SiO₂). SiO₂ is classified as an acidic impurity.

3. **Determine the Type of Flux Needed**:
- To remove acidic impurities like SiO₂, a basic flux is required. Basic fluxes react with acidic impurities to form a slag that can be removed.

4. **Select the Appropriate Basic Flux**:
- Calcium oxide (CaO) is a common basic flux used in metallurgy. It reacts with SiO₂ to form calcium silicate (CaSiO₃), which is the slag.

5. **Write the Reaction**:
- The reaction can be represented as:
\[ \text{SiO}_2 + \text{CaO} \rightarrow \text{CaSiO}_3 \]
- This reaction shows that calcium oxide combines with silicon dioxide to form calcium silicate, which is the slag.

6. **Conclude the Answer**:
- Therefore, the flux used to remove the impurity of SiO₂ is **Calcium Oxide (CaO)**.

### Final Answer:
The flux to remove the impurity of SiO₂ is **Calcium Oxide (CaO)**.

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