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Before charging FeO into a blast furnace, it is first roasted to Fe2O3 because

1. it will not be eliminated along with silica as slag
2. it will not volatilize inside the furnace
3. its presence will raise the melting point of the charge
4. none of the above

Correct answer: it will not be eliminated along with silica as slag

Solution

FeO is basic/easily fusible and combines with the silica gangue to form a low-melting slag (FeSiO3), so the iron would be lost in the slag. Roasting it to Fe2O3 first prevents this, so the correct reason is that it will not be eliminated along with silica as slag.

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