During the formation of the slag by the reaction of flux and impurities which of the following is an example of acidic and basic flux?
(i) `FeO+SiO_(2)rarrFeSiO_(3)`
(ii) `SiO_(2)+MgOrarrMgSiO_(3)`

Options

A. (i) `SiO_(2)-" Acidc flux (ii) MgO - Basic flux"`
B. (i) `SiO_(2)-" Basic flux (ii) MgO - Acidic flux"`
C. (i) `SiO_(2)-" Basic flux (ii) MgO - Basic flux"`
D. (i) `SiO_(2)-" Acidic flux (ii) MgO - Acidic flux"`

Answer

To determine which of the given reactions represents an example of acidic and basic flux during the formation of slag, we can analyze the two reactions provided:

1. **Reaction (i)**: \( \text{FeO} + \text{SiO}_2 \rightarrow \text{FeSiO}_3 \)
2. **Reaction (ii)**: \( \text{SiO}_2 + \text{MgO} \rightarrow \text{MgSiO}_3 \)

### Step-by-Step Solution:

**Step 1: Identify the nature of the fluxes and impurities.**

- **Acidic Flux**: A substance that can donate protons (H⁺ ions) or accept electron pairs. Common examples include silicon dioxide (\( \text{SiO}_2 \)).
- **Basic Flux**: A substance that can accept protons or donate electron pairs. Common examples include magnesium oxide (\( \text{MgO} \)) and calcium oxide (\( \text{CaO} \)).

**Step 2: Analyze Reaction (i)**

- In the reaction \( \text{FeO} + \text{SiO}_2 \rightarrow \text{FeSiO}_3 \):
- \( \text{FeO} \) is a basic oxide (impurity).
- \( \text{SiO}_2 \) is an acidic oxide (flux).
- This reaction shows that an acidic flux (\( \text{SiO}_2 \)) reacts with a basic impurity (\( \text{FeO} \)) to form a slag (\( \text{FeSiO}_3 \)).

**Step 3: Analyze Reaction (ii)**

- In the reaction \( \text{SiO}_2 + \text{MgO} \rightarrow \text{MgSiO}_3 \):
- \( \text{SiO}_2 \) is again an acidic oxide (impurity).
- \( \text{MgO} \) is a basic oxide (flux).
- This reaction shows that a basic flux (\( \text{MgO} \)) reacts with an acidic impurity (\( \text{SiO}_2 \)) to form another slag (\( \text{MgSiO}_3 \)).

**Step 4: Conclusion**

From the analysis:
- In Reaction (i), \( \text{SiO}_2 \) acts as the acidic flux.
- In Reaction (ii), \( \text{MgO} \) acts as the basic flux.

Thus, we conclude:
- **Acidic Flux**: \( \text{SiO}_2 \) (from Reaction (i))
- **Basic Flux**: \( \text{MgO} \) (from Reaction (ii))

### Final Answer:
- **Acidic flux**: \( \text{SiO}_2 \)
- **Basic flux**: \( \text{MgO} \)