Zone refining is based on the principle that

Options

A. Impurities of low boiling metals can be separated by distillation
B. Impurities are more soluble in molten metal than in solid metal
C. Different components of a mixture are differently adsorbed on an adsorbent
D. Vapours of volatile compound can be decomposed in pure metal

Answer

B

Explanation

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