Q.

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

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a

CaCO3 + CaO + CO2

b

2C + O2 → 2CO

c

C + O2 → CO2

d

Fe2O3 + 3CO → 2Fe + 3CO2

answer is A.

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Detailed Solution

In this portion, limestone gets decomposed and the resultant lime (CaO) acts as flux, combines with silica (present as impurity - gangue) to form calcium silicate (fusible slag). The reaction is endothermic as heat is required to break chemical bonds in the compound undergoing decomposition.
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