The most efficient method of extraction of beryllium is

The most common method of extraction of metals from oxide ores involve

Which is the most efficient method for separating D_2 from H_2 ?

The most suitable method for extraction of copper from low grade sulphide ore is

The common method of extraction of metals from oxide ores is

A metal has a high concentration into the earth crust and whose oxides cannot be reducted by carbon. The most suitable method for the extraction of such metal is: