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
B.
to decompose bauxite
Molten alumina is bad conductor of electricity and melting point of alumina is very high, so cryolite [Na3AlF6]is used in the extraction of aluminium to decompose bauxite (alumina) and decrease melting point of alumina. The reactions taking place during electrolysis are
The common method of extraction of metals from oxide ores is
reduction with carbon
reduction with hydrogen
reduction with aluminium
electrolytic method