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Write the principle of used for refining of germanium.

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Refining of aluminium is based on the principle that the impurities are more soluble in the molten state than in the solid state of the metal.

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The basic principle of zone refining is -

low boiling metallic impurities are separated by distillation

the impurities are more soluble in the molten metal than in the solid metal

the different constituents of a mixture are absorbed differently in an adsorbent

pure metal is obtained by decomposing the vapours of volatile compound obtained from the impure metal