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Q)

Before introducing $FeO$ in blast furnace , it is converted to $Fe_2O_3$ by roasting so that

$ (a)\;\text{It may not be removed as slag with silica} \\(b)\;\text{It may not evaporate in the furnace } \\(c)\;\text{Presence of it may increase the m.pt. of charge } \\ (d)\;\text{ None.} $

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A)
The process of roasting is performed to remove moisture, CO2, impurities of Sulphur, Arsenic. Ferrous oxide is also oxidized to ferric oxide.
Hence a is the correct answer.
 
Comment
A)
a) it may not be removed as slag with siica
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