Question

The most impure form of iron is :

• A. wrought iron
• B. mild steel
• C. hard steel
• D. pig iron

Answer 1

The correct option is D pig iron

Pig iron is the most impure form of iron.

Chemical Composition of Pig Iron-

C: 3.5-4.5%;

Mn: 0.4-1.0%;

Si: 0.5-1.2%;

P: 0.15%

Steel is made by removing most of carbon and other impurities from pig iron.