Is smelting of Iron ore endothermic or exothermic?

Smelting of iron ore is an exothermic process. Fe2O3 + 3CO = 2Fe + 3CO2 + 22.7 kJ. Delta-H (change in enthalpy) for the reaction is -22.7 kJ. Smelting is a redox reaction as it involves the reduction of a compound of a metal, usually an oxide, to free metal. But all redox reactions are not exothermic though most are. read more

Neither endothermic nor exothermic. These two terms apply to chemical reactions, wether they require or produce energy (heat). Melting iron isn't a chemical but a physical reaction, a change of phase, solid to liquid. read more