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Which sequence of reactions accurately depicts the chemical processes involving iron and its associated compounds?

1. Fe reacts with dilute H2SO4 to form FeSO4, which further reacts with H2SO4 and O2 to produce Fe2(SO4)3, and upon heating, reverts to Fe.
2. Fe combines with O2 under heat to form FeO, which reacts with dilute H2SO4 to yield FeSO4, and upon heating, returns to Fe.
3. Fe reacts with Cl2 under heat to produce FeCl3, which upon heating in air converts to FeCl2, and then reacts with Zn to regenerate Fe.
4. Fe reacts with O2 under heat to form Fe3O4, which reacts with CO at 600°C to yield Fe, then forms FeO and reacts with CO at 700°C to regenerate Fe.

Correct answer: Fe reacts with dilute H2SO4 to form FeSO4, which further reacts with H2SO4 and O2 to produce Fe2(SO4)3, and upon heating, reverts to Fe.

Solution

The correct sequence involves iron reacting with dilute sulfuric acid to form iron(II) sulfate, which then reacts with sulfuric acid and oxygen to produce iron(III) sulfate, and upon heating, it reverts back to iron.

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