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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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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.
answered Mar 20, 2014 by meena.p
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a) it may not be removed as slag with siica
answered Apr 29, 2016 by shubhranshumalhotra.sm

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