(A) Zone refining is a technique used to obtain metals of very high purity. It is based on the principle that the impurities are more soluble in the m

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(A) Zone refining is a technique used to obtain metals of very high purity. It is based on the principle that the impurities are more soluble in the molten state of the metal than in the solid state. This method is particularly useful for producing semiconductors like $Si$,$Ge$,$Ga$,and $In$ in a highly pure form.