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Which sequence of reactions correctly describes the chemistry of iron and its compounds?

1. Fe --Cl2, heat--> FeCl3 --heat, air--> FeCl2 --Zn--> Fe
2. Fe --O2, heat--> Fe3O4 --CO, 600 deg C--> FeO --CO, 700 deg C--> Fe
3. Fe --dil H2SO4--> FeSO4 --H2SO4, O2--> Fe2(SO4)3 --Heat--> Fe
4. Fe --O2, heat--> FeO --dil H2SO4--> FeSO4 --Heat--> Fe

Correct answer: Fe --O2, heat--> Fe3O4 --CO, 600 deg C--> FeO --CO, 700 deg C--> Fe

Solution

Fe burns in O2 to Fe3O4, which CO reduces stepwise to FeO and then to Fe, matching blast-furnace chemistry.

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