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(a) Give an example of zone refining of metals.
(b) What is the role of cryolite in the metallurgy of aluminium?

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(a) This method is very useful for producing semiconductor and other metals of very high purity like germanium, silicon, boron etc.
(b) Role of cryolite in metallurgy of Aluminimm-Cryolite is added to lower the melting point pf mixture and to increase the conductivity of electrolyte.

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