Identify the decreasing order of carbon content in different forms of iron.

Options

A. Wrought iron gt Pig iron gt Cast iron
B. Pig iron gt Cast iron gt Wrought iron
C. Cast iron gt Pig iron gt Wrought iron
D. Cast iron gt Wrought iron gt Pig iron

Answer

To identify the decreasing order of carbon content in different forms of iron, we need to understand the carbon content in each type of iron. The three main forms of iron we will consider are pig iron, cast iron, and wrought iron.

### Step-by-Step Solution:

1. **Understand the Forms of Iron**:
- **Pig Iron**: This is the first product of smelting iron ore with coke and limestone in a blast furnace. It contains a high carbon content.
- **Cast Iron**: This is made by melting pig iron and adding a small amount of scrap iron. It has a lower carbon content than pig iron but is still significant.
- **Wrought Iron**: This is produced by further refining cast iron and has the lowest carbon content among the three.

2. **Determine the Carbon Content**:
- **Pig Iron**: Contains approximately **5% carbon**.
- **Cast Iron**: Contains approximately **4% carbon**.
- **Wrought Iron**: Contains approximately **1% carbon**.

3. **Arrange in Decreasing Order**:
- Based on the carbon content, we can arrange the forms of iron from highest to lowest carbon content:
- **Pig Iron** (5% carbon) > **Cast Iron** (4% carbon) > **Wrought Iron** (1% carbon).

4. **Conclusion**:
- The correct decreasing order of carbon content in different forms of iron is:
- **Pig Iron > Cast Iron > Wrought Iron**.

### Final Answer:
The decreasing order of carbon content in different forms of iron is:
**Pig Iron > Cast Iron > Wrought Iron**.