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An Intiative by Sri Chaitanya
a
In the middle part, lime stone decomposes to give CO2 and lime which acts as a reducing agent.
b
In the lower part, called zone of fusion temperature (1773 K) coke burns to CO2 producing 97000 cal of heat.
c
In the middle part, of the furnace called zone of heat absorption (temperature 1073 - 1273 K) CO2 is reduced to CO.
d
At the top is the zone of reduction (temperature 673 - 973 K). Here iron oxide is reduced to spongy iron by CO.
answer is A.
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