(C) In a blast furnace,the combustion zone (also known as the tuyere zone) is located at the bottom where hot air is blasted into the furnace. This zo

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(C) In a blast furnace,the combustion zone (also known as the tuyere zone) is located at the bottom where hot air is blasted into the furnace. This zone has the highest temperature,reaching approximately $2000 \ K$ to $2200 \ K$,due to the exothermic reaction of coke with oxygen: $C + O_2 \rightarrow CO_2 + \text{Heat}$.