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Describe the role of the following: C...

Describe the role of the following:
Coke in the extraction of iron from its oxides.

Text Solution

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Coke is source of heat in blast furnace and acts as a reducing agent for iron ore. Coke is burnt to produce carbon monoxide which later reacts with the iron oxides to reduce them in steps to yield iron, further it reacts with silica impurities to remove them as soluble impurities.
`C(s) +(1)/(2)O_(2) to CO(g)`
`3Fe_(2)O_(3)+CO to 2Fe_(2)O_(3) +CO_(2)`
`Fe_(3)O_(4) +4CO to 3Fe +4CO_(2)`
`Fe_(2)O_(3) +CO to 2FeO +CO_(2)`
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