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JEE Main levelSingle correct optionDifficulty 2 of 3mt127

Which reaction supplies most of the heat in the blast furnace and takes place in the hottest region near the air blast?

A $CaCO X_{3} CaO + CO X_{2}$
B $CO X_{2} + C 2 CO$
C $C + O X_{2} CO X_{2}$
D $CaO + SiO X_{2} CaSiO X_{3}$

Answer: C

Hot air entering through the tuyeres burns coke exothermically,

C + O X_{2} CO X_{2}

, giving the highest temperature.

CaCO X_{3}

decomposition and

CO X_{2} + C 2 CO

are endothermic, and slag formation releases comparatively little heat.

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