In smelting of iron, which of the following reactions takes place in Blast furnace at `400^(@)C-600^(@)C`

Options

A. `CaO_SiO_(2)rarrCaSiO_(3)`
B. `2FeS+3O_(2)rarr 2Fe+SO_(2)`
C. `FeO+SiO_(2)rarr FeSiO_(3)`
D. `Fe_(2)O_(3)+3COrarr 2Fe+3CO_(2)`

Explanation

To solve the question regarding the reactions that take place in the blast furnace during the smelting of iron at temperatures between 400°C and 600°C, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Process**:
- The smelting of iron involves the reduction of iron oxides to produce iron. This process occurs in a blast furnace where iron ore (primarily Fe2O3) is heated with carbon (usually in the form of coke).

2. **Identifying the Reaction**:
- At temperatures between 400°C and 600°C, carbon monoxide (CO) is a significant reducing agent. The primary reaction that occurs in this temperature range involves the reduction of iron(III) oxide (Fe2O3) by carbon monoxide.

3. **Writing the Balanced Reaction**:
- The reaction can be represented as follows:
\[ \text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2 \]
- In this reaction, iron(III) oxide reacts with carbon monoxide to produce iron and carbon dioxide.

4. **Conclusion**:
- Therefore, the correct reaction that takes place in the blast furnace at the specified temperature is:
\[ \text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2 \]
- This corresponds to option 4 in the given choices.