Heating pyrites to remove sulphur is called
smelting
calcination
liquation
roasting
D.
roasting
Heating pyrites to remove sulphur is called roasting because in roasting ore is heated below its melting point in presence of air, so sulphur reacts with oxide to remove as volatile oxide.
In the metallurgy of which of the following cupellation process is used?
Copper
Silver
Iron
Aluminium
Cryolite is used in the electrolytic extraction of aluminium
to obtained more alumimium
to decompose bauxite
to protect anodes
as a reducing agents
The common method of extraction of metals from oxide ores is
reduction with carbon
reduction with hydrogen
reduction with aluminium
electrolytic method