The temperature of blast furnace to produce iron from its ore Fe2 O3 varies from 500°C at the top of the furnace to about 1900°C at the bottom of the furnace. The reaction between the ore Fe2 O3 and CO at the lowest temperature (~ 500°C) is
a. 3Fe2 O3 + CO → 2 Fe3 O4 + CO2
b. Fe2 O + CO → 2 FeO + CO2
c) Fe2 O3 + 3CO → 2Fe + 3 CO2
d) Fe2 O3 + CO + CaCO3 → Fe2 O3 + CO + CO2 + CaO.
