Question

The variety of iron that contains less than 0.1 percent of carbon is

• A. steel.
• B. wrought iron.
• C. pig iron.
• D. cast iron

Answer 1

The correct option is B

wrought iron.

The explanation for the correct option -

• Iron in the earth's crust is found in the form of ores like Haematite, Magnetite, etc.
• These ores are taken in a blast furnace to extract a pure form of iron.
• The most impure form of Iron that is extracted from the blast furnace is Pig Iron, which contains almost 4-5% of Carbon.
• On heating the pig iron further, it produces the purest form of Iron, i.e., Wrought Iron which contains less than 1% of Carbon.

The explanation for the incorrect options -

• Option A is incorrect because steel is an alloy of Iron and Carbon which is a widely used form of Iron that contains 1-2% of carbon.
• Option C is incorrect because the most impure form of Iron that is extracted from the blast furnace is Pig Iron, which contains almost 4-5% of Carbon.
• Option D is incorrect because cast iron is the form of Iron that contains 2-4% Carbon.

Hence, Option B is the correct answer.