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Which type of iron is presented by the following diagram?

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Which type of iron is presented by the following diagram?

(a) Iron (II) oxide

(b) Iron (I) oxide

(c) Iron (III) oxide

(d) Iron oxide

I had been asked this question in exam.

My enquiry is from Steel and Iron Work in division Rules and Methods of Measurement of Civil Engineering Drawing

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Right choice is (d) Iron oxide

For explanation I would say: Iron (III) oxide or ferric oxide is the inorganic compound with the formula Fe2O3. It is one of the three main oxides of iron, the other two being iron (II) oxide (FeO), which is rare, and iron (II, III) oxide (Fe3O4), which also occurs naturally as the mineral magnetite. As the mineral known as hematite, Fe2O3 is the main source of iron for the steel industry.

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