Question

The most impure and pure forms of iron respectively are:

• A. Pig iron, Cast iron
• B. Cast iron, Wrought iron
• C. Wrought iron, Pig iron
• D. Wrought iron, Cast iron

Answer 1

The correct option is B

Cast iron, Wrought iron

Pig/Cast iron are most impure forms of iron-containing (2.5 - 5) % of carbon and other impurities like Mn, Si, S, P.

Wrought iron is the purest form of iron-containing (0.1 - 0.25) % carbon.