In the stages involved in the extraction of metals in general - give reasons for following
Magnetic separation is not used during the dressing of bauxite ore in the extraction of aluminium.

In the stages involved in the extraction of metals in general - give reasons for following An electromagnetic wheen is used in the magnetic separation process of ore from gangue.

In the stages involved in the extraction of metals in general - give reasons for following Conversion of concentrated ore to its oxide is an essential step in the ectraction of metals from the ore, even the step is not necessary in the metallurgy of aluminium.

In the stages involved in the extraction of metals in general - give reasons for following Dressing of the ore is an essential process in the extraction of metal from its ore.

In the stages involved in the extraction of metals in general - give reasons for following In the froth flotation process, the ore floats on the top & the gangue settles down.

In the stages involved in the extraction of metals in general - give reasons for following Roasting of the concentrated ore is carried out in the presence of excess air, while calcination of the concentrated ore in the absence or limited supply of air.

In the stages involved in the extraction of metals in general - give reasons for following Reduction of metallic oxides to metal in the extraction of metals from the ores - is based on the position of the metal in the activity series.

In the stages involved in the extraction of metals in general - give reasons for following Coke is not preferred as a reducing agent in the reduction of the oxide of mercury to its metal, but is preferred in the reduction of the oxide of zinc to its metal.

In the stages involved in the extraction of metals in general - give reasons for following Roasting the ore generally results in evolution of sulphur dioxide gas, while calcination of the ore evolves carbon dioxide gas.

The extraction of metals from sulphide ore involves

In the stages involved in the extraction of metals in general - give reasons for following Oxide or halides of highly electropositive metals e.g. K, Na, Ca, Al are reduced to metals by electrolysis and not by reduction with coke.