Q.

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

Moderate

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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.CaCO3​→CaO+CO2​CaO+SiO2​→CaSiO3​
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