The purest form of $F e$ is:

stainless steel.

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steel.

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cast iron.

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wrought iron.

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Solution

The correct option is D wrought iron.
Stainless steel has 10% chromium by weight.

In steel, carbon constitutes upto 2.1% by weight.

Cast iron has carbon and silicon 2.1-4% by weight and 1-3% by weight respectively.

Wrought iron has 0.04-0.08% of carbon content.

Hence Wrought iron is the purest form of Fe.

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