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By which process Iron can be prepared?

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By which process Iron can be prepared?

(a) From magnetite

(b) Iron oxide

(c) Oxidation of metals

(d) All of the mentioned

I got this question in my homework.

This is a very interesting question from Catalyst topic in chapter Hydrocarbon Synthesis and Hydroformylation of Unit Processes

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Correct choice is (d) All of the mentioned

Best explanation: Iron catalysts may be prepared for commercial applications by precipitation from solution, from magnetite (Fe3O4) ore, or from magnetite obtained by fusion of iron oxides, or by oxidation of metallic iron with steam.

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