Which of the following forms of iron has highest melting point ?

Options

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

Answer

To determine which form of iron has the highest melting point among pig iron, cast iron, steel, and wrought iron, we can analyze the melting points of each type:

1. **Pig Iron**:
- Pig iron is a crude form of iron and is produced in a blast furnace.
- The melting point of pig iron is approximately **1420 to 1470 Kelvin** (or about **1147 to 1200 degrees Celsius**).

2. **Cast Iron**:
- Cast iron is made from molten pig iron and contains a higher carbon content.
- The melting point of cast iron is around **950 degrees Celsius**.

3. **Steel**:
- Steel is an alloy of iron with a carbon content of up to 2%.
- The melting point of steel is approximately **1370 degrees Celsius**.

4. **Wrought Iron**:
- Wrought iron is an alloy of iron with a very low carbon content (less than 0.08%).
- The melting point of wrought iron is about **1540 degrees Celsius**.

Now, comparing the melting points:
- Pig Iron: 1147 to 1200 °C
- Cast Iron: 950 °C
- Steel: 1370 °C
- Wrought Iron: 1540 °C

From the above values, we can conclude that **wrought iron has the highest melting point** among the forms of iron listed.

**Final Answer**: Wrought iron has the highest melting point.

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