Which of the following reaction in the blast furnaces are endothermic ?

Options

A. `C_((s))+O_(2(g)) hArr CO_(2(g))`
B. `CO_(2(g))+C_((s)) hArr 2CO_((g))`
C. `CaCO_(3(s)) hArr CaO_((s))+CO_(2(g))`
D. `Fe_(2)O_(3(s))+3CO_((g)) hArr 2Fe(l)+3CO_(2(g))`

Answer

B, C

Explanation

Reduction of `CO_(2)` to C is endothermic `CO_(2)+C to 2CO`
Decomposition of `CaCO_(3)` is endothermic `CaCO_(3) to CaO+CO_(3)`