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How much iron does cementite contain?

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How much iron does cementite contain?

(a) 6.67%

(b) 24.23%

(c) 73.4%

(d) 93.3%

This question was addressed to me in quiz.

My question is taken from Iron and Iron Carbide System topic in portion Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

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Right option is (d) 93.3%

The best explanation: Cementite is an intermetallic compound of iron-carbon (Fe3C). It has a solubility that is negligible with a composition of 6.67% C and 93.3% Fe.

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