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What is the chemical formula of cementite?

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in Casting-Forming-Welding II by (119k points)
What is the chemical formula of cementite?

(a) Fe3O4

(b) Fe2O3

(c) Fe3C

(d) FeSO4

I have been asked this question by my school principal while I was bunking the class.

My question is taken from Transformation in Steel topic in section Heat treatment of Metals and Alloys of Casting-Forming-Welding II

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Best answer
Right answer is (c) Fe3C

The best explanation: None.

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