Chemistry - Metallurgy Question with Solution | TestHub

In a blast furnace, most of the hematite (Fe₂O₃) is reduced indirectly by CO in the upper and middle zones, so (A) is correct.

At higher temperatures (lower zone), direct reduction by solid carbon (C) also occurs, while CO acts mainly in lower-temperature zones, so (B) is correct.

The reduction proceeds stepwise: Fe₂O₃ → Fe₃O₄ → FeO → Fe, so (C) is also correct.

Since all statements are correct, the right answer is (D) All the above are correct.