Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

Why is zinc not extracted from zinc oxide through reduction using CO?

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu_2O with :

Write chemical equations for the extraction of copper from its sulpide ore.

How is copper extracted from low grade copper ores ?

What is the role of coke in the extraction of iron from its oxides?

Why the graphite rods in the extraction of aluminium from molten Al_2O_3 have to be replaced from time to time ?

How copper is extracted from its sulhide ore.write balanced equation.

Why are sulphide ores converted to oxide before reduction ?

Give the steps involvd in the extraction of metals of low and medium reactivity from their respective sulphide ores.