Name two metals which occurs native(free) in nature.
Gold and silver are occur native in nature.
infusible impurities to fusible material
soluble impurities to insoluble impurities
The method of zone refining of metals is based on the principle of
higher melting point of impurity than that of the pure metal
greater noble character of the solid metal than that of the impurity
greater solubility of the impurity in the molten state than in the solid.
greater mobility of the pure metal than that of the impurity.
In electro refining of metals, the pure metal is made the anode and a strip of pure metal the cathode during the electrolysis of an aqueous solution of a complex metal salt. This method cannot be used for refining of
Silver
Copper
Aluminium
Zinc
Electrochemical process (electrolysis of fused salt) is employed to extract:
iron
lead
sodium
silver
Zinc refining is a method to obtain
Very high temperature
Ultra pure Al