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Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic .

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Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic .
A. `CaCO_(3) to CaO + CO_(2)`
B. `2C+O_(2)to 2CO`
C. `C+O_(2) to CO_(2)`
D. `Fe_(2)O_(3) + 3CO to 2Fe+3CO_(2)`
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Correct Answer - A
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