Which of the following reactions taking place in the blast furnace during extraction of iron is endothermic? (RPMT 2006)

In the metallurgy of iron, limestone is added as a flux that forms a lime-silica slag that floats on the top of the furnace and can be removed. Due to the heat in the furnace, lime stone decomposes and leads to the formation of calcium oxide and the process is endothermic. 3 2 CaCO (s) CaO(s)+CO (g) Therefore, the correct answer is option (a) 3 2 CaCO (s) CaO(s)+CO (g)