Multiple choice

Among the following, which is the purest form of iron?

  1. steel

  2. white cast iron

  3. grey cast iron

  4. wrought iron
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Wrought iron is the purest form of iron among the options, containing only 0.008-0.05% carbon. Steel contains 0.2-2% carbon, while cast irons (both white and grey) have 2-4% carbon. The very low carbon content makes wrought iron more ductile, malleable, and corrosion-resistant, though it's also softer than steel.

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