Purest form of commercial iron is :

Options

A. Wrought iron
B. Cast iron
C. Pig iron
D. Iron scrap + pig iron

Answer

To determine the purest form of commercial iron, we need to analyze the different types of iron based on their carbon content. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Types of Iron
The question provides several types of iron:
- Wrought Iron
- Cast Iron
- Pig Iron
- Iron Scrap plus Pig Iron

### Step 2: Understand Carbon Content
The purity of iron can be assessed by its carbon content:
- **Wrought Iron**: Contains less than 0.1% carbon.
- **Cast Iron**: Contains about 2% to 4% carbon.
- **Pig Iron**: Contains about 3.5% to 4.5% carbon.
- **Iron Scrap**: Varies, but generally contains impurities.

### Step 3: Compare Carbon Content
- Wrought iron has the lowest carbon content, making it the purest form of iron.
- Cast iron and pig iron have higher carbon content, indicating more impurities.
- Iron scrap is a mix of various iron types and generally contains higher levels of impurities.

### Step 4: Conclusion
Based on the carbon content, wrought iron is the purest form of commercial iron. Therefore, the answer to the question is:

**The purest form of commercial iron is: Wrought Iron (Option A)**.