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 metal 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

Zone refining is based upon fractional crystallisation as the impurity prefers to stay in the melt and on solidification only the pure metal solidifies.