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Iron combines easily with ___________ to make iron carbide.

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Iron combines easily with ___________ to make iron carbide.

(a) manganese

(b) carbon

(c) steel

(d) chromium

I had been asked this question in semester exam.

My question comes from Steel and its Alloys-1 topic in chapter Steel and its Alloys of Aerospace Materials & Processes

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Right option is (b) carbon

To elaborate: Iron combines easily with carbon and results in iron carbide. It is also known as cementite. The greater the amount of carbon, the greater the amount of ultimate strength and hardness. But, ductility decreases.

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