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a
At below 800°C, is better reducing agent to reduce FeO
b
At above 1000°C, carbon is better reducing agent to reduce FeO, which it self converts into CO
c
In blast furnace, most of the reduction of Fe2O3 is carried by CO
d
In the reduction of metal oxides like ZnO, SnO2, PbO etc. Carbon is used as reducing agent , as reduction carried at high temperatures
answer is A.
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