The method of zone refining of metals is based on the principle of :

Options

A. greater noble character of the solid metal than that of the impurity
B. greater solubility of the impurity in the molten state than in the solid
C. greater mobility of the pure metal than that of impurity
D. higher melting point of the impurity than that of the pure metal

Answer

B

Explanation

The method of zone refining of metals is based on the principle of greater solubility of the impurity in the molten state than in the solid. Elements which are used as semiconductors like Si, Ge, Ga, etc, are refined by this method. Gallium arsenide and indium antimonide (also used as semiconductor) are also refined by this method.