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 important ore of lead is
chalcopyrite
haematite
galena
cast iron
A.
chalcopyrite
Chalcopyrite(CuFeS2) is copper ore.
Haematite (Fe2O3) is lead ore.
Galena (PbS) is lead ore.
Bauxite (Al2O3.2H2O) is aluminium ore.
The common method of extraction of metals from oxide ores is
reduction with carbon
reduction with hydrogen
reduction with aluminium
electrolytic method