The chemical process in the production of steel from haematite ore involves:

reduction

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oxidation

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reduction followed by oxidation

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oxidation followed by reduction

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Solution

The correct option is D oxidation followed by reduction
First, by calcination and roasting, the ferrous oxide is oxidized to ferric oxide. then, in blast furnace, smelting is done, where it is reduced to get iron.
$4 F e O + O_{2} \to 2 F e_{2} O_{3}$
$F e_{2} O_{3} + C O \to 2 F e_{3} O_{4} + C O_{2}$
$F e_{2} O_{3} + C O \to F e O + C O_{2}$ $
$F e O + C O \to F e + C O_{2}$

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