Before introducing FeO in blast furnace, it is converted to Fe_2O_3 by roasting so that (a) it ma...

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Before introducing FeO in blast furnace, it is converted to Fe_2O_3 by roasting so that
(a) it may not be removed as slag with silica
(b) it may not evaporate in the furnace
(c) presence of it may increase the m.pt. of charge
(d) None of these.

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