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The hot air blown into the blast furnace...

The hot air blown into the blast furnace must be free from moisture - why?

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In presence of moisture endothermic reaction of Coke takes place. `C+H_(2)O hArr CO+H_(2)`
Due to this reaction temperature of the furnace decreases and at that lower temperatuere `Fe_(2)O_(3)` cannot be reduced by Coke.
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