Question

Zone refining is based on the principle that________.

• 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 component of a mixture are differently adsorbed on an adsorbent
• D. vapours of volatile compound can be decomposed in pure metal

Answer 1

The correct option is B impurities are more soluble in molten metal than in solid metal

Zone refining is based on the difference in solubility of impurities in molten and solid state of the metal. Semi conductors like $Si,Ge$ and $Ga$ are purified by this method.