what chemical process is used for obtaining a metal from oxide

The chemical process used for obtaining a metal from its oxide is reduction. Reduction is carried out using reducing agents such as carbon, sodium, aluminum, or calcium. The metal oxides are reduced by using a reducing agent which is carbon or highly reactive metals. The reduction process is useful to obtain free metal from oxides. The reduction reaction chosen depends on the chemical reaction or reactivity of metals. For example, metallic zinc is obtained from zinc oxide by heating it with carbon. The chemical reaction for this process is ZnO(s) + C(s) → Zn(s) + CO(g) .