Impurities present in wrought iron ?

Options

A. C
B. `CaCO_(3)`
C. `Fe_(2)O_(3)`
D. `SiO_(2)`

Explanation

### Step-by-Step Solution

1. **Understanding Wrought Iron**:
- Wrought iron is known as one of the purest forms of iron. It is produced through the smelting process in a blast furnace, which helps to remove most impurities.

2. **Identifying Impurities Before Smelting**:
- Before the iron is processed in the blast furnace, it contains various impurities such as sulfur, manganese, and silicon. These impurities are present in the raw materials used for iron production.

3. **Impurities After Smelting**:
- After the smelting process in the blast furnace, the amount of impurities in wrought iron is significantly reduced. The primary impurity that remains in wrought iron is carbon.

4. **Carbon Content in Wrought Iron**:
- The carbon content in wrought iron is approximately 0.25%. This is much lower compared to cast iron or steel, which can contain carbon levels ranging from 2% to 4%. Thus, the low carbon content is what makes wrought iron a purer form of iron.

5. **Conclusion**:
- Therefore, the main impurity present in wrought iron is carbon, while other impurities like CaCO3 (calcium carbonate) and SiO2 (silicon dioxide) are used as flux during the smelting process and do not remain as impurities in the final product.

### Final Answer:
The impurities present in wrought iron are primarily carbon (approximately 0.25%).