Question

Co is used in the extraction of metal​

Answer 1

Carbon can be used to reduce the oxides of metals below aluminium in the Reactivity Series. (Reduction is the removal of oxygen.) For example, carbon is used in the extraction of zinc, iron, and lead. ... (Copper and silver are often found in compounds, but are easily extracted, sometimes by just heating the compound.)

Answer 2

carbon can be used to reduce the oxide from metal oxides to obtain the metal and this process is known as smelting